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  • Development  (17)
  • Springer  (17)
  • American Institute of Physics (AIP)
  • Institute of Electrical and Electronics Engineers (IEEE)
  • 1975-1979  (17)
  • 1978  (17)
Collection
Publisher
  • Springer  (17)
  • American Institute of Physics (AIP)
  • Institute of Electrical and Electronics Engineers (IEEE)
Years
  • 1975-1979  (17)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 184 (1978), S. 273-283 
    ISSN: 1432-041X
    Keywords: Nervous system ; Development ; Imaginal discs ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The pathway of adult sensory nerves has been analysed in three experimental situations: (i) in flies with grossly abnormal thoracic morphology resulting from X-irradiation early during development, (ii) in flies which had been subjected to surgical operations late in the larval period, (iii) in homoeotic mutants. The results provide experimental support for a simple mechanism in which developing adult axons join the nearest larval nerve and are guided by it up to the central nervous system. In particular, experimental interference with normal development can result in nerves from different segments, or from dorsal and ventral appendages, joining each other and entering the central nervous system together.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 184 (1978), S. 325-350 
    ISSN: 1432-041X
    Keywords: Optic lobes ; Compound eyes ; Development ; Odonata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Des résultats antérieurs ayant montré une certaine dépendance du lobe optique envers l'oeil composé au cours du développement post-embryonnaire, il importait de préciser le rôle joué par les fibres post-rétiniennes qui relient ces deux organes. On pouvait, en particulier, se demander si l'activité mitotique du massif d'accroissement commun aux deux ganglions optiques externes (la lamina et la medulla) est contrôlée par le nombre de fibres postrétiniennes néoformées, ou bien si le rôle régulateur des fibres post-rétiniennes s'exerce plus tard, au moment de la différenciation des cellules ganglionnaires. Afin de répondre à ces questions trois types d'opération impliquant l'activité des fibres post-rétiniennes ont été pratiquées: (1) Une déficience en fibres post-rétiniennes néoformées a été obtenue par ablation de la zone d'accroissement oculaire et son remplacement par du tégument banal. (2) Une surcharge en jeunes fibres post-rétiniennes a été réalisée par l'induction de zones d'accroissement oculaires supplémentaires à la suite de rotations antéro-postérieures de volets oculaires. (3) Des “témoins-opérés” ont subi l'ablation, puis la remise en place immédiate de volets oculaires identiques à ceux des séries précédentes. Les résultats obtenus ont permis de préciser les processus régulateurs qui contrôlent la croissance du lobe optique en la rendant dépendante de la croissance de l'oeil sus-jacent. Cette régulation, qui consiste en un ajustement exact du nombre des cellules ganglionnaires fonctionnelles à celui des fibres postrétiniennes, s'exercerait à trois niveaux: (1) Une première régulation de la croissance contrôlerait le nombre total de neuroblastes dans le massif d'accroissement externe, la quantité de ces cellules embryonnaires étant d'autant plus élevé que la densité de fibres post-rétiniennes serait plus forte. Par contre, le taux mitotique du massif d'accroissement, qui s'est révélé invariable, ne serait pas sous le contrôle des fibres post-rétiniennes. (2) Une seconde régulation, beaucoup plus précise, s'effectuant dans la lamina, consisterait en la différenciation des seules cellules ganglionnaires contactées par les fibres post-rétiniennes néoformées, les cellules surnuméraires dégénérant alors rapidement. L'action différenciatrice s'exercant au niveau des autres ganglions, medulla et lobula, nécessiterait la présence à la fois des fibres post-rétiniennes à orientation centripètes, et des fibres centrifuges. (3) Un ultime processus régulateur, qui implique l'intégrité des fibres postrétiniennes, assurerait le maintien des cellules ganglionnaires fonctionnelles.
    Notes: Summary Since to earlier results indicated a dependence of the optic lobe on the compound eye during post-embryonic development, it appeared essential to specify the part played by the post-retinal fibres connecting these two organs. Especially, we wondered if the mitotic activity in the outer optic anlage common to the two outer optic ganglia (lamina and medulla) was controlled by the number of newly-neoformed post-retinal fibres, or if the regulating influence from the post-retinal fibres takes place later, during the differentiation of the ganglion cells. In order to answer these questions, three kinds of operation were performed: (1) removal, in young larvae, of the zone producing new ommatidia. This operation deprives the optic of the arrival of new post-retinal fibres below the operated level. (2) overloading of post-retinal fibres, by inducing zones that produced supernumerary ommatidia. (3) removal of an ocular volet, followed by its immediate reinsertion, to provide a “surgery-control”. The following results were obtained: (1) A preliminary growth regulation controlled the total number of neuroblasts in the outer optic anlage. However, the permanent mitotic activity of these cells was not controlled by post-retinal fibres. (2) A second regulation, much more precise, occurring in the lamina, consisted in the differentiation of the ganglion cells being affected by the new post-retinal fibres. The supernumerary cells then rapidly degenerated. (3) A last regulatory process, implying the integrity of post-retinal fibres, maintained the ganglion cells.
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  • 3
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    Springer
    Development genes and evolution 184 (1978), S. 1-13 
    ISSN: 1432-041X
    Keywords: Cell division ; Development ; Cryptobiosis ; Nauplius larva
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Cell division during embryonic development of the brine shrimp,Artemia salina has been studied by counting nuclei and mitotic figures. No cell division was observed during development of the encysted gastrula until about an hour before emergence of the embryo (a pre-nauplius) from the cyst, and even then only a few mitotic figures were observed. Following emergence, and during further development up to the stage II nauplius larva an increase of about 25% in the number of cells occurs. However, when the newly hatched larva is exposed to FUdR (10 μg/ml) cell division is largely inhibited, but observable development nevertheless proceeds normally. Evidently all processes involved with the development of the gastrula into a stage II nauplius larva can occur with far fewer cells than normally are present.
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  • 4
    ISSN: 1432-2048
    Keywords: Cotyledons ; Brassica ; Development ; Intracellular localization ; Lipase ; Microsomal membrane fraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In homogenates of resting rapeseeds no lipase activity (glycerolester hydrolase, EC 3.1.1.3) could be detected using a titrimetric assay procedure. Following a 30-h lag-phase after imbibition, lipase activity increased sharply, reaching its maximum at day 4 after sowing. Simultaneously triglyceride content of the cotyledons decreased sharply. At any time during the 11-day period of seedling growth examined, only an alkaline lipase activity with a pH optimum around 9 was present. White light had essentially no effect on the development of lipase activity. However, the disappearance of lipase activity from the cotyledons after fat utilization was found to depend on nitrogen nutrition of the seedlings. The activities of the glyoxysomal enzymes catalase and malate synthetase showed the usual rise and fall patterns with peak activities at day 4 after sowing, independently of the mineral nutrition of the seedlings. About 90% of the lipase activity was associated with a microsomal membrane fraction. Resolution of this fraction by sucrose density gradient centrifugation (62,000 g for 14 h) yielded three distinct membrane fractions. Maximum activities of membrane marker enzymes were recovered from the gradients at following densities: The major portion of microsomal protein and lipase activity at 1.085 kg/l; microsomal malate synthetase and phosphorylcholineglyceride transferase at 1.116 kg/l; NADH-cytochrome c reductase and phosphorylcholinecytidyl transferase at 1.133 kg/l. Evidently in rapeseed cotyledons lipase activity is associated only with a discrete microsomal membrane fraction which sediments differently from membrane fractions of the endoplasmic reticulum.
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  • 5
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    Archives of microbiology 117 (1978), S. 221-226 
    ISSN: 1432-072X
    Keywords: Nematophagous fungus ; Giant functional traps ; Mutation ; Development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mutagenesis with nitrosoguanidine yielded two classes of ring trap mutants in the predacious HyphomyceteDactylella brochopaga: strains which could make no traps and those with a proportion of giant, functional traps. A third strain, derived from a trapless strain made abnormally small functional traps. The giant traps are described, together with developmental abnormalities they sometimes display. The characteristics of the chief mutant strains are discussed.
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  • 6
    ISSN: 1432-072X
    Keywords: Physarum polycephalum ; Amoebae ; Aminopeptidases ; Acid proteases ; Regulation ; Development ; Differential gene activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The cultivation of Physarum polycephalum amoebae in two media with different protein contents revealed a regulation of aminopeptidases and proteases depending on the albumin content of the medium: in growing amoebae and plasmodia the aminopeptidases have similar isoenzyme patterns and relative activities against nitroanilides. One alanine and four leucine aminopeptidase isoenzymes were found within the slightly acid pH range. During growth amoebae secrete—different from plasmodia—leucine aminopeptidase into the medium with low protein content. In an albumin-rich medium additional alanine aminopeptidase activity was found. Out of nine plasmodial proteases four were found in amoebae too. Only one band (pI 3.6) was present in the protein-poor medium. No protease activity could be detected in the proteinrich medium.
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  • 7
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    Theoretical and applied genetics 52 (1978), S. 269-271 
    ISSN: 1432-2242
    Keywords: Daphnia Pulex ; Development ; Sex Determination ; Ecological factors ; Identical Chromosome Sets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Sex-dependent differences in the state of the nuclear chromatin of somatic cells were found in Daphnia pulex. It is suggested that the genome of Daphnia pulex has two developmental programmes based on identical chromosome sets. The female programme consistently functions under a wide range of ecological conditions, whereas the male programme is turned on by specific ecological stimuli. The genes controlling the activation and function of the male programme may be phenotypically latent for many parthenogenetic generations.
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  • 8
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    Springer
    Cell & tissue research 189 (1978), S. 203-217 
    ISSN: 1432-0878
    Keywords: Astrocytes ; Development ; Phagocytosis ; Neuroplasticity ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Previous studies have demonstrated that astrocyte processes are responsible for a spontaneously occurring phagocytosis of boutons on cat spinal motoneurons during the second postnatal week. In the present investigation, the astrocytes and the astrocyte processes in contact with the motoneurons were studied qualitatively and quantitatively during the early postnatal period. It could be concluded that the cells responsible for the phagocytosis of boutons are immature astrocytes. These cells were present not only during the period of phagocytosis but also prior to this period. The type of process responsible for the phagocytosis was present not only during the period of phagocytosis but also prior to and after that period although the relative contribution of such processes to the glia-covered membrane area of the motoneurons was reduced in the older animals. On the basis of these results, the possible specificity of the immature astrocyte as the element responsible for the phagocytosis of boutons during normal development is discussed.
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  • 9
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    Cell & tissue research 188 (1978), S. 465-480 
    ISSN: 1432-0878
    Keywords: Steroidogenic cells ; Gonads ; Mouse ; Development ; Ultrastructural differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Different steps in mouse ovarian and testicular development have been studied in order to compare the time sequences during the in vivo differentiation of steroidogenic cell populations growing in contact with male and female gonocytes. These time sequences indicated a basic common developmental pattern: early signs of steroid synthesis in the male gonad, but late entering into meiotic prophase of XY germ cells; early meiosis but late steroidogenic activity in the ovary. In both male and female interstitial tissues, signs of involution were found following a period of exponential development.
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  • 10
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    Cell & tissue research 188 (1978), S. 491-496 
    ISSN: 1432-0878
    Keywords: Castration ; LH-cells ; Rat ; Development ; Sex-steroids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The effects of sex-steroids on the LH-cell development in neonatal rats were studied. The cells were stained immunohistochemically by applying anti-HCG serum. On the second day after birth some of the animals of both sexes were gonadectomized and simultaneously injected with testosterone or estradiol (50 or 200 μg). The remaining animals were either gonadectomized or injected with either one of the sex-steroids. The LH-cell numbers in each group were determined on the 12th day of age from serially cut histological sections of the pituitary. In castrated males the number of LH-cells was about twice that of the intact animals. In the so-called sex-zone, LH-cells tended to be hypertrophied in castrates. These alterations in the appearance of LH-cells did not occur after ovariectomy. In gonadectomized animals injected with sexsteroids (200 μg), the cells were markedly reduced in number and size, both in males and females. Testosterone injection (50 μg) into intact newborn animals also suppressed the numerical development of LH-cells, especially in females. These alterations were particularly evident in the sex-zone in both sexes. Thus the present findings show that sex-steroids may be involved in sexual differences in morphological development of LH-cells in newborn rats.
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  • 11
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    Springer
    Plant ecology 37 (1978), S. 1-17 
    ISSN: 1573-5052
    Keywords: Development ; Model ; Peat bog ; Simulation ; Vegetation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A dynamic model is developed which simulates changes in peat bogs on different kinds of slopes. The relationships between the elements of the model which include bog plants, fen plants, water, peat and nutrients, are defined based on data from an earlier study of vegetation in the Rothenthurm area in Switzerland, and from published sources. The model is tested for its performance on three types of slope, starting development at a hypothetical state with low amounts of all variables. The development of bogs is traced until a stable state is reached at equilibrium. It is evident from the results that the establishment of a mature stable system takes longest on the flat slope. On all three slopes the peat layer reaches its maximum value before the equilibrium is reached at a slightly reduced peat level. As were observed in the fied, most slope types do not allow a peat bog to persist long under the local climatical conditions, but changes are forced in the vegetation toward a fen type with higher nutrient supply. It was however possible to simulate a stable peat bog when the slope was flat enough (type C in main text). The results of simulation reproduced with reasonable accuracy the shape of the bogs investigated in the field, the abundance of bog and fen plant species, the ground water table, the thickness of peat and the state of nutrient concentrations in the site. The model is rendered to have minimum complexity by assumptions, described in the main text, to reproduce only those properties of peat bogs that were considered primary in importance in the field. The extent to which the model can help to better understand the natural system is discussed.
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  • 12
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    Cell & tissue research 187 (1978), S. 1-24 
    ISSN: 1432-0878
    Keywords: Insect sensillum ; Mechanoreceptor ; Development ; Ultrastructure ; Gryllus bimaculatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The filiform hairs, mechanoreceptors of Gryllus, pass through six developmental stages during the last larval stage. The cytoplasm of their sense cells suggests intensive synthesis of protein for cellular metabolism and intercytoplasmic exchange of material via glial evaginations. Ultrahistochemical tests demonstrated acid phosphatase in the lysosomes as well as in components of the Golgi apparatus. There was no significant change in the appearance of the sense cell cytoplasm, indicating a maintained functional state also during molting. The new cuticular apparatus is formed after apolysis by the three enveloping cells. Formation of the replacement hairs is initiated by a cytoplasmic outgrowth of the trichogen cell. During morphogenesis of the new hair, the microtubules serve as a cytoskeleton and probably control the flow of vesicles, which contain phenol oxidase, also demonstrated in the Golgi apparatus, and are incorporated into the new cuticle. Bundles of microfibrils are involved in the surface sculpturing of the replacement hair. The trichogen cell also forms a number of structural elements, e.g. the “cup” and “strut” marked geometric peculiarities of which indicate that they are important in the spatial orientation of the dendrite and thus also in transduction. Reduction of the apical cell membrane of the tormogen cell after apolysis permits unrestricted growth of the new hair into the exuvial space. The tormogen cell participates in the formation of the joint membrane, parts of the socket and the articulation of the hair.
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  • 13
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    Cell & tissue research 191 (1978), S. 121-139 
    ISSN: 1432-0878
    Keywords: Insect sensilla ; Development ; Sexual dimorphism ; Antennal input ; Periplaneta americana L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The morphology of the antennal hair-sensilla of Periplaneta americana, their distribution and frequency on the antennal flagellum have been examined by transmission and scanning-electron microscopy. The types of sensilla were distinguished with respect to physiologically relevant criteria such as wall structure and number of sensory cells. Among the sensilla of the antenna of the adult male, long, single-walled sensilla with four sensory cells (type sw B), probably responsible for reception of sexual pheromones, are most frequent, representing about 54% of the antennal sensilla. About half of these sensilla are newly-formed at the imaginai ecdysis; the other half are derived from the shorter type sw B sensilla of the nymphal antenna. Short type sw B sensilla are present in all larval stages of both sexes and in adult females as well. During the imaginal ecdysis of males, however, the length of these sensilla increases to double that found in nymphs. Dendritic branches also increase in number. During postembryonic development, the number of sensory fibers in the antennal flagellum increases nearly 20-fold, from 14,000 in the first larval instar to about 270,000 in the adult male. The greatest increase, approximately 90%, occurs during the last developmental stage.
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  • 14
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    Cell & tissue research 195 (1978), S. 195-203 
    ISSN: 1432-0878
    Keywords: Blood-brain barrier ; Horseradish peroxidase ; Spinal cord ; Cerebellum ; Development ; Chick embryo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary One to 20 mg of horseradish peroxidase (HRP) was injected into the allantoic vein of chick embryos between the 7th to 21st day of incubation and its penetration from blood into the interstitium of cerebellum and spinal cord (upper thoracic) was examined by light and electron microscopy in order to study development of the blood-brain barrier. Until the 12th day of incubation (stage 38) the reaction products, indicating the presence of peroxidase, were distributed in every region of the intercellular spaces in both cerebellum and spinal cord, whereas in 13th and 14th day embryos (stage 39 and 40) they were observed only in the medullary regions. In the embryos after 15th day (stage 41) they filled only the intravascular lumen and some micropinocytotic vesicles in the endothelium. These results show that the blood-brain barrier to HRP develops roughly synchronously in various parts of the central nervous system and evolves independently of neurogenesis, the course of which differs considerably in the cerebellum and spinal cord.
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  • 15
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    Cell & tissue research 193 (1978), S. 139-154 
    ISSN: 1432-0878
    Keywords: Adenohypophysis ; Scyllium canicula ; Stellate cells ; Development ; Granules
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Granular hormone-producing cells and agranular cells (stellate cells, including giant and pericavitary cells) were electron microscopically studied in the hypophysis of the small spotted dogfish (Scyllium canicula) up to several months after hatching. Comparisons of results obtained in embryos, newly hatched fish and adults show an increase of the mean granule diameter in the four major endocrine cell types. Small granule cells which are present in all lobes are especially numerous in the ventral lobe. The structures observed in certain cavity boundary cells suggest a role in resorption and transport.
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  • 16
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    Cell & tissue research 193 (1978), S. 525-532 
    ISSN: 1432-0878
    Keywords: Intranuclear inclusions ; Neurons ; Development ; Ultrastructure ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of intranuclear rodlets, microtubules, fibrillar lattices and membranous inclusions found in the developing cuneate nuclei of rats is described. Rodlets, ranging in diameter from 96–312 nm and in length from 1–2 μm, are made up of tightly packed straight filaments measuring 5–8 nm in diameter. Microtubules with a diameter of 26 nm are clustered together. Fibrillar lattices are made up of fibrils with a diameter of 9 nm arranged in layers or sets. Two to nine sets make up a lattice, with a maximum width of 68 nm, in which the adjacent sets are arranged at an angle to each other. Rodlets and fibrillar lattices occur in 6.8% of the neurons. Membranous inclusions, reported here for the first time in normal neurons, are of 2 types: small vesicles of 0.1–0.6 μm and large vacuoles measuring 1–2 μm. Both types are bounded by either a single or a double membrane and generally have an electron lucent content. Membranous inclusions occur in 25.3 % of the neurons. Changes in the frequency of occurrence of the various intranuclear inclusions in the course of postnatal development are also reported.
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  • 17
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    Cell & tissue research 194 (1978), S. 219-236 
    ISSN: 1432-0878
    Keywords: Heart ; Innervation ; Development ; Autonomic nerves
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The development of innervation to the atrial myocardium of rabbits from 20th day of gestation to 35 days postnatal was studied ultrastructurally by electron microscopy and by demonstration of catecholamines by histofluorescence. Special attention was directed to the first morphologic appearance of nerve fibers and terminals and the closeness of juxtaposition of terminals with myocardial cells. Adrenergic and cholinergic terminals were identified on the basis of their differential ability to take-up and store the “false adrenergic neurotransmitter” 5-hydroxydopamine. Adrenergic terminals were first encountered at 20 days of gestation whereas cholinergic terminals could not be positively identified until the 24th day of gestation. Throughout development adrenergic terminals were more numerous than cholinergic, about 71 % of the terminals encountered being adrenergic. Many terminals approach closely (20–30 nm) to the sarcolemma of the muscle cells of the atrium. In many instances adrenergic and cholinergic fibers travel together in the same nerve bundle and are closely apposed without intervening Schwann-cell cytoplasm. Such a relationship could allow peripheral interaction between these fibers in the myocardium.
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