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  • Articles  (6)
  • Light and electron microscopy  (6)
  • Springer  (6)
  • 2005-2009
  • 1970-1974  (6)
  • 1955-1959
  • 1
    Electronic Resource
    Electronic Resource
    Studies on the acetylcholinesterase (ache)-positive and -negative autonomic axons supplying smooth muscle in the normal and 6-hydroxydopamine (6-OHDA)treated rat iris (1973)
    Springer
    Cell & tissue research 138 (1973), S. 211-222 
    Details
    ISSN: 1432-0878
    Keywords: Iris ; Muscle, Nerves ; Light and electron microscopy ; Acetylcholinesterase ; 6-Hydroxydopamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The adrenergic and cholinergic innervation to the rat iris has been studied at a light and electron microscopic level. Catecholamine fluorescence histochemistry showed adrenergic nerves to be present in both the dilatator and the constrictor pupillae regions. At a fine structural level the terminal innervation of the iris was studied and criteria for the differentiation between presumptive adrenergic and presumptive cholinergic axon terminals were examined. To aid this examination presumptive adrenergic axons were either labelled with the “false” adrenergic transmitter, 5-hydroxydopamine, or chemical sympathectomy performed using 6-hydroxydopamine. The value of using acetylcholinesterase staining as a marker for cholinergic nerve terminals was also studied. Results showed a mixed adrenergic/cholinergic innervation to the dilatator pupillae. In the constrictor pupillae an exclusively cholinergic innervation was found although adrenergic and cholinergic nerves were found supplying the blood vessels and at the dilatator-constrictor interface. These findings are discussed with regard to innervation-function relationships in the iris.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306608
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrastructural investigation of the postnatal development of the hamster harderian gland (1973)
    Springer
    Cell & tissue research 142 (1973), S. 1-12 
    Details
    ISSN: 1432-0878
    Keywords: Harderian gland ; Hamster ; Sexual dimorphism ; Alveolar cells ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The lobules of the Harderian glands of young male and female hamsters are widely separated by connective tissue and are made up of alveolar cells containing small vacuoles. There is considerable increase in the size of the lobules by 12 days. Based on size distribution of vacuoles two types of alveolar cells can be recognized in the male hamsters 4 weeks and older. The Harderian glands of 2-week animals of both sexes contain a black-brown pigment. The appearance of pigment is accompanied by a proliferation of membranes. In the female the amount of pigment increases with increasing age until 4 weeks of age and then remains at a relatively stable level. In the male no pigment was found after 4 weeks of age. Membrane-bounded juxtanuclear structures are present in the alveolar cells of both sexes until 3 weeks of age. These structures appear to play different roles in the male and female hamsters. The differentiation of the alveolar cells into light and dark types must take place during the 3rd week of postnatal development. A possible relationship between the levels of gonadal hormones and the occurrence of pigment at different ages in both sexes is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306700
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  • 3
    Electronic Resource
    Electronic Resource
    The structural organization of glomerular neuropile in the olfactory and accessory lobes of an Australian freshwater crayfish, Cherax destructor (1973)
    Springer
    Cell & tissue research 142 (1973), S. 37-61 
    Details
    ISSN: 1432-0878
    Keywords: Crustacean CNS ; Olfactory and accessory lobes ; Glomerular neuropile ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The olfactory and accessory lobes of the crayfish, Cherax destructor contain glomeruli. Light microscope and electron microscope studies show that these glomeruli are the only regions of synaptic activity in the lobes and that at least four separate sets of axons meet within the glomeruli. The olfactory glomeruli are column shaped, complex structures with no large single pre- or postsynaptic elements. The accessory lobe glomeruli follow a more conventional pattern and each has one large axon ending in a terminal arborization where it makes synaptic contact with large numbers of smaller fibres. The large fibre is presynaptic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306703
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  • 4
    Electronic Resource
    Electronic Resource
    The structure of the gills of the elasmobranch, Scyliorhinus canicula (L.) (1973)
    Springer
    Cell & tissue research 144 (1973), S. 489-509 
    Details
    ISSN: 1432-0878
    Keywords: Gills ; Scyliorhinus canicula ; Circulation sphincters ; Hydrostatic skeleton ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The anatomy of the blood supply to the gills of the dogfish, Scyliorhinus canicula, is described. The anatomical basis for a counter-current exchange system at the respiratory surfaces is reported. Within the interbranchial septum there is a capillary network joining all the afferent branchial arterioles of the gill. The structure of the walls of the corpus cavernosum is found to be of smooth muscle cells supported by a basal lamina and connective tissue and lined by endothelial cells containing phagocytic vesicles. Both the capillary network and corpus cavernosum are suggested to function in smoothing the pressure pulses of the blood flow. Pre- and post-lamellar vessels and pre- and post-lamellar sphincters are described. The sphincters are thought to control the number of secondary lamellae physiologically in the respiratory circuit, and by retaining blood within nonperfused lamellae to act in conjunction with pillar cells (contracting in antagonism to the hydrostatic skeleton of the blood) to maintain the rigidity of secondary lamellae in the water current. Whorls of cells of unknown function are found within the interbranchial septum. In the epithelium lining the water channel large cells having a complexly branching plasma membrane and a very large central vacuole occurs. The cytoplasm lining the lumen contains numerous vacuoles each surrounded by a double membrane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307376
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  • 5
    Electronic Resource
    Electronic Resource
    Fine structural studies of rat adrenal cortices following prostaglandin administration (1973)
    Springer
    Cell & tissue research 146 (1973), S. 297-307 
    Details
    ISSN: 1432-0878
    Keywords: Adrenal cortex ; Prostaglandins E1 and E2 ; Fine structure ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Histological and fine structural studies of adrenal cortices were performed on male Sprague-Dawley rats which had been given intravenous injections of prostaglandin E1 or E2. It was found that there were increased numbers of intracellular lipid droplets, free ribonucleoprotein particles, cholesterol ester clefts and coated vesicles of both the small and large varieties. A reorganization of the internal mitochondrial membranes and the appearance of protrusions of parenchymal cytoplasm into the sinusoidal lumina accompanied by vasodilation were also observed. These alterations are not typical of those observed following exogenous ACTH administration and are therefore considered to be prostaglandin-induced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02346222
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  • 6
    Electronic Resource
    Electronic Resource
    Morphology of the gill epithelium of the Lungfish, Lepidosiren paradoxa (1974)
    Springer
    Cell & tissue research 153 (1974), S. 365-381 
    Details
    ISSN: 1432-0878
    Keywords: Gills ; Lepidosiren paradoxa ; Epithelia ; Transport adaptions ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The gills of Lepidosiren are very much reduced, consisting of a few lobe-like filaments. The gill epithelium differs from most other fish in being 4–7 layers thick. Three varieties of cell are described which occur in the inner epithelial layers. It is suggested that these represent stages in the synthesis of a granular secretory product. The superficial cells show characteristics of all 3 cell varieties, the granules apparently being voided into the microvillar pits at the surface. Surface cells are joined by junctional complexes typical of fish epithelia. Epithelial cells are separated by interstitial channels which are bridged by long cytoplasmic processes united by prominent desmosomes. Elongate mucous cells occur in large numbers. The Golgi apparatus is exceptionally large and well defined. It is characterised by accumulation of secretory products at numerous points along the cisternae. Wandering cells containing large granules and 2 types of leucocytes are also present in the interstitial channels. It is suggested that the gill epithelium is involved in active transport; pinocytotic vesicles are present on both sides of the inner epithelial cell layer and the blind interstitial channels are characteristic of transporting epithelia in which steady osmotic gradients operate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229165
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