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  • 1970-1974  (6)
  • 1
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    The neurohypophysis of the crested newt (1973)
    Springer
    Details
    Publication Date: 1973-01-01
    Print ISSN: 0302-766X
    Electronic ISSN: 1432-0878
    Topics: Biology , Medicine
    Published by Springer
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  • 2
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    The neurohypophysis of the crested newt (1972)
    Springer
    Details
    Publication Date: 1972-01-01
    Print ISSN: 0302-766X
    Electronic ISSN: 1432-0878
    Topics: Biology , Medicine
    Published by Springer
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    PAPER CURRENT
  • 3
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    A golgi study on tanycytes and liquor-contacting cells in the posterior hypothalamus of the newt (1974)
    Springer
    Details
    Publication Date: 1974-11-01
    Print ISSN: 0302-766X
    Electronic ISSN: 1432-0878
    Topics: Biology , Medicine
    Published by Springer
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  • 4
    Electronic Resource
    Electronic Resource
    The neurohypophysis of the crested newt (1973)
    Springer
    Cell & tissue research 141 (1973), S. 203-221 
    Details
    ISSN: 1432-0878
    Keywords: Median eminence ; Newt ; Zones ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the median eminence of the newt a medial region and two lateral regions are described. In cross section, the medial region appears to be made up of 1) an outer or glandular zone (Zone I) containing aldehyde-thionine-positive and negative nerve fibres and blood capillaries. Nerve fibres appear aligned in palisade array along the capillaries. 2) An inner zone (Zone II) made up of a) a layer of aldehyde-thionine-positive nerve fibres (fibrous layer) belonging to the preoptic hypophyseal tract and b) a layer of ependymal cells lining the infundibular lumen and reaching the blood vessels with their long processes. The lateral regions display a less pronounced stratification and aldehyde-thionine positive nerve fibres are nearly absent. A slender lamina (ependymal border) containing mainly aldehyde-thionine-positive nerve fibres and ependymal cells connects the median eminence to the pars nervosa. At the ultrastructural level, in the outer zone of the medial region at least 4 types of nerve fibres and nerve endings are identified: Type I nerve fibres containing granular vesicles of 700–1000 Å and clear vesicles (250–400 Å). Type II nerve fibres containing granular vesicles and polymorphous granules of 900–1300 Å and clear vesicles (250–400 Å). Type III nerve fibres containing dense granules of 1200–2000 Å and clear vesicles of 250–400 Å. Type IV nerve fibres containing only clear vesicles of 250–400 Å. In the inner zone too, all these nerve fiber types are found among ependymal cells, while the fibrous layer consists of nerve fibres containing granules of 1200–2000 Å in diameter. In the lateral regions Type I, Type II and Type IV nerve fibres and their respective perivascular terminals are found; axons containing dense granules (1200–2000 Å) are scanty. In these regions typical synapses between Type I nerve fibres and processes rich in microtubules are visible. The classification and functional significance of nerve fibres in the median eminence are still unsolved, but it may be assumed that nerve fibres of the medial region belong to both the preoptic hypophyseal and tubero hypophyseal tract, while the lateral regions are characterized by nerve fibres of the tubero hypophyseal tract. Peculiar specializations of the ependymal cells in the median eminence of the newt are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00311354
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  • 5
    Electronic Resource
    Electronic Resource
    The neurohypophysis of the crested newt (1972)
    Springer
    Cell & tissue research 134 (1972), S. 367-382 
    Details
    ISSN: 1432-0878
    Keywords: Crested newt ; Pars nervosa ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the crested newt, the ultrastructural organization of the pars nervosa is analogous to that already known in non-mammal tetrapods. An orderly array of ependymal cells makes up the inner limiting layer while less abundant pituicytes are irregularly distributed within this organ. “Light” and “dark” pituicytes can be distinguished on the basis of the relative density of the cytoplasmic matrix and the distribution of the cell organelles. Both the ependymal cells and pituicytes are rich in dense bodies and possess extensive processes which ramify among the nerve fibers, often reaching the pericapillary space which they can line for long distances. The main components of the pars nervosa are nerve fibers and nerve terminals (type A), containing electron dense granules 1200–2000 Å in diameter together with clear vesicles averaging 250–400 Å. These fibers are likely to correspond to the aldehyde fuchsin positive neurosecretory fibers revealed by light microscopy. Differences in the granule size within the fibers and terminals lead to further recognition of two subgroups (A1 and A2). Other fibers and terminals (type B) containing clear vesicles and granular vesicles 600 to 1000 Å in diameter, possibly of aminergic type, are also encountered. These fibers are rare and can be seen only in the portion of the pars nervosa near the pars intermedia of the adenohypophysis. Lastly, fibers and terminals containing only clear vesicles ranging from 250 to 400 Å (type C) are occasionally found. Nerve endings are often formed by type A fibers on the perivascular space and on the perivascular processes of the ependymal cells and pituicytes. In agreement with recent findings available in the literature, the occurrence of synaptoid contacts between these terminals and both pituicytes and ependymal cells may confirm the active role of these cells in transport and release of neurosecretion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307172
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  • 6
    Electronic Resource
    Electronic Resource
    A golgi study on tanycytes and liquor-contacting cells in the posterior hypothalamus of the newt (1974)
    Springer
    Cell & tissue research 154 (1974), S. 151-166 
    Details
    ISSN: 1432-0878
    Keywords: Hypothalamus ; Urodela ; Tanycytes ; Liquor ; contacting cells ; Golgi methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Golgi methods were employed to study neurons and ependymal tanycytes in the posterior hypothalamus of the newt. The tanycytes send a few coarse, spiny or barbed processes towards the pia mater. In the periventricular grey, the neurohistological methods show common neurons, ranging from a multipolar to a plumed organization, and abundant liquor-contacting cells. These cells, possibly neurons, give rise to a process that reaches the cerebro-spinal fluid, and terminates in a spindle-shaped swelling, with a thin thread at its tip. In other cells, the intraventricular endings are bulbous or finger-like. The occurrence of: (1) branches of the liquor-contacting process, running parallel to the infundibular surface; (2) infundibular processes which end at the base or between the ependymal cell bodies; and (3) axons coursing in the same position, all indicates that the subependymal layer is a site for complex intercellular relationships. The significance of liquor-contacting cells and tanycytes is discussed, in view of the possibility that they may represent part of a system for hypothalamic regulation in response to changes in the CSF.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223161
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