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  • Life and Medical Sciences
  • 1970-1974  (504)
  • 1973  (257)
  • 1971  (247)
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  • 1970-1974  (504)
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  • 11
    Electronic Resource
    Electronic Resource
    A structural and functional analysis of walking in the turtle, Chrysemys picta marginata (1971)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 134 (1971), S. 195-213 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Walking of Chrysemys has been studied by cinephotography and x-rays. The lateral sequence, diagonal couplet gait, limb support sequence, and wide track provide great stability, yet a slight pitch and roll cause some plastral drag. Velocity ranges from 28 mm to 51 mm/second, and fluctuates within a stride. Limb movements and structure resemble those of other ectotherms, but incorporate modifications reflecting the animal's short, broad trunk encased in a shell and carried close to the ground. The triradiate pectoral girdle so articulates with the shell as to act as a truss for weight transfer to the ground. Girdle rotation increases the efficiency of the girdle as a truss, and contributes to locomotor efficiency. The glenoid cavities are more than twice as far apart as the acetabula, so a thrust from the pectoral girdle has less propulsive efficiency on the center of gravity than one from the acetabulum. The humerus and femur are protracted to a greater extent than in other ectotherms and their horizontal arcs of retraction are less. Rotation of these elements about their longitudinal axes contributes to the length of a stride and to foot placement and withdrawal. Differences in the movements of comparable segments of front and hind limbs correlate with differences in the width of the girdles, a crus longer than the antebrachium, and different capacities for joint rotation.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051340205
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  • 12
    Electronic Resource
    Electronic Resource
    Masthead (1971)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 134 (1971) 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051340301
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  • 13
    Electronic Resource
    Electronic Resource
    Tooth replacement in the red-backed salamander, plethodon cinereusThis research was supported by grant GB 17112 from the National Science Foundation. (1971)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 134 (1971), S. 259-269 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The developmental cycle of the teeth in Plethodon cinereus is analyzed on morphological grounds using alizarin preparations. All the stages in development do not occupy the same proportion of the life cycle time. Functional teeth and germs at an early stage in development occupy a large proportion of the life cycle time, whereas the processes of tooth shedding and ankylosis occur very quickly. The time during which any locus does not bear a functional tooth, and is therefore a non-functional locus, is reduced to a minimum. P. cinereus has a basic pattern of tooth replacement which is consistent with Zahnreihen which are 2.0 tooth spaces apart. Variations in the replacement pattern are common and these are produced by relatively small fluctuations in the spacing of the Zahnreihen around the „mean„ of 2.0. Localized disturbances which produce breaks in the replacement pattern and cause waves to cross also occur. These may be due to the failure of tooth germs to develop, the fusion of tooth germs, or may be the result of the inherent variability in a complex biological system. This variability causes individual tooth germs to develop too slowly or too quickly and hence assume an „abnormal“ position thus causing breaks in the replacement pattern. Tooth replacement may be controlled by an intra-local mechanism(s) rather than by stimuli which travel along the jaw.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051340302
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  • 14
    Electronic Resource
    Electronic Resource
    Masthead (1971)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 134 (1971) 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051340401
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  • 15
    Electronic Resource
    Electronic Resource
    A gross study of the compartmentalized stomach of two new-world camelids, the llama and guanaco (1971)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 134 (1971), S. 399-423 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The llama and guanaco stomach consisted of three compartments. A transverse pillar divided the large, first compartment into cranial and caudal sacs. Both sacs contained recessed glandular saccules. The saccules in the caudal sac were everted during the gastric contraction cycle. The non-recessed surfaces of this compartment were covered by stratified squamous epithelium.The first compartment communicated on the right with a smaller, reniform second compartment. Except on the lesser curvature, this compartment contained deep cells which were lined by a papillated glandular mucosa.The ventricular groove, defined by a single muscular lip, coursed along the cranial sac of the first compartment, over the lesser curvature of the second compartment, and terminated at the tubular passage to the third compartment.The initial four-fifths of the elongate third compartment contained mucigenous glands like those found in the saccules and cells of the first and second compartment Proper gastric glands and pyloric glands were confined to the terminal one-fifth of the third compartment.Attempts to homologize the compartments of the camelid stomach with those of the Pecora or so-called advanced ruminants were unsuccessful. The results of this study and concurrent physiologic investigations indicated that the processes of ruminant digestion can operate within wide anatomic boundaries, and that the camelid stomach with its extensive glandular mucosa is adapted for greater digestive efficiency than the advanced ruminant stomach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051340403
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  • 16
    Electronic Resource
    Electronic Resource
    The regeneration of caudal epidermal specializations in Lygodactylus picturatus keniensis (gekkonidae, Lacertilia) (1971)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 134 (1971), S. 467-477 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The epidermal covering of the tail scales of the gekkonid lizard Lygodactylus bears three distinct types of specialization: sense organs, pilose pads whose function is either sensory or scansorial or both, and holocrine secretory organs (β-glands) which are only found in males. The same specializations are found on regenerated tails, and although the morphological form and patterning of the scales do not resemble the original, the structure, distribution and sexual specificity of the specialized units is perfectly restored. These structures, and similar units in other lacertilian genera have certain resemblances to mammalian and avian epidermal specializations. Perfection of replacement of integumentary specializations can be correlated with functional demands, although the developmental mechanism underlying the phenomenon is unknown.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051340407
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  • 17
    Electronic Resource
    Electronic Resource
    Fine structure at the basal surface of intestinal epithelium in the midgut region of the balanidae, with special reference to “Neural-like” processes (1971)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 135 (1971), S. 1-12 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Observations on fine structure at the basal end of the intestinal epithelium in the midgut region of Balanus balanoides and Balanus improvisus reveal complex interrelationships among several tissues. Numerous elongate cell processes extend towards the intestinal epithelium penetrating between layers of intestinal muscle through blood spaces and into the basal lamina underlying the epithelium.Two types of morphological relationships occur between cell processes and the basal end of the intestinal epithelial cell: 1. The cell process may penetrate the basal lamina and lie closely apposed to the epithelium. 2. The cell process may give rise to narrow, medially-directed, finger-like extensions (projections). The narrow projections penetrate the basal lamina and, in addition, terminate as dilated bulbs within inpocketings of the epithelium. In some respects the cell processes are suggestive of neural tissue.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051350102
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  • 18
    Electronic Resource
    Electronic Resource
    A histological and histochemical study of the male reproductive system of artemia (Crustacea, Branchiopoda)This investigation was supported in part by a NASA predoctoral traineeship and by a Lebanon Valley College Faculty Research grant. This is part of a thesis submitted in partial fulfillment of the requirements for a Ph.D. in zoology at the University of Vermont. (1971)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 135 (1971), S. 51-69 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The male reproductive system of Artemia was studied by routine histological and histochemical techniques to demonstrate the general histology and distribution of proteins, carbohydrates, lipids, and alkaline and acid phosphatases.The System Consists Of Paired Testes, Vasa Deferentia, Accessory Glands, And Penes. The Testes Contain Germ Cells And Supporting Cells Throughout Their Entire Length. The Former Cells Are Located In Clusters And Undergo A Spermatogenic Maturation Which Is Similar To That Described For OtherAnimals. The Supporting Cells Seem Implicated In The Nourishment Of The Germ Cells. The Vas Deferens, Which Consists Of Secretory Epithelium Surrounded By Circular And Longitudinal Muscles, Secretes The Seminal Fluid, Containing A Neutral Mucopolysaccharide Or Mucoprotein, And Stores The Mature Sperm. The Accessory Gland Consists Of Approximately 20 Pairs Of Gland Cells, Each Pair Drained By A Neck Cell And Duct Cell Into The Collecting Duct. The Glandular Secretion, Mainly A Neutral Mucopolysaccharide Or Mucoprotein, Might Function As A Lubricant, A Copulatory Plug, Or An “Activator Substance” For The Sperm Or For Fertilization. Each Penis Consists Of A Non-Eversible Part And An Eversible Part Which Is A Tortuous Muscular Tube That Connects The Vas Deferens To The Outside.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051350104
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  • 19
    Electronic Resource
    Electronic Resource
    Reproductive systems of the north indian langur (Presbytis entellus entellus Dufresne) (1971)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 135 (1971), S. 99-129 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The gross anatomy and histology of the gonads and accessory sex organs are described for male and female Presbytis e. entellus. The langur differs from other catarrhine monkeys in certain specialised characters. The “sexual skin” is not comparable to the true sexual skin of the Cercopithecinae which exhibits cyclical change during the various phases of reproduction; it is nevertheless fully developed in the adult male and serves as one of the secondary sexual characters.Certain aspects of the reproductive system strikingly resemble those of man. The combined testicular weight (0.07% body weight) is similar to the human (0.08%), and the male has ampullary glands. The cervical canal is straight like that of a baboon or man. The corpus luteum (except in the lactating female) is a hollow glandular structure. Extensive hemorrhage which always accompanies ovulation in the langur, does not appear to be a common phenomenon in any other catarrhine for which ovulation and the development of corpus luteum have been studied. The hemorrhagic remains are retained for a long time in the ovulated follicle.The ovary is characteristically large and averages 0.74 gm without corpus luteum and 1.57 gm with corpus luteum, a feature never reported in any other catarrhine monkeys. The pre-ovulatory follicle may attain a size of 14 × 14 mm.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051350107
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  • 20
    Electronic Resource
    Electronic Resource
    Masthead (1971)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 135 (1971) 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051350401
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