Abstract
Characteristics of the ependymal cells of the Paraventricular Organ (PVO) in the sparrow are strongly dilated ergastoplasmic cisternae filled with a moderately dense substance, the absence of cilia and a long basal process ending around capillaries. Elongated cells having a pale cytoplasm ("light cells") are interposed between the ependymal cells. These cells protrude into the ventricle lumen with a bulbous cytoplasmic swelling; centrioles and several dense-core vesicles occur frequently in them. Two types of nerve cells have been identified in the PVO. The more superficial cells - called type-I neurons have a dendrite-like process which, after passing the ependymal layer reach the ventricle surface and end there freely with a bulbous swelling ("club"). The whole neuron contains dense-core vesicles of an average diameter of 840 Å; the extensive Golgi region is located in the dendrite. The larger type-II neurons situated in the deeper layers show a folded nuclear membrane, large mitochondria and rarely dense-core vesicles; the Golgi apparatus is enclosed in the perikaryon. The nerve cells are embedded in a feltwork of glial and neural processes the latters showing often synaptic (axodendritic) junctions. The majority of the synapses are supposed to occur between the axon-like processes of the typeI neuron and dendrites of the type-II neuron. Axo-somatic synapses can be found not infrequently on the perikarya of the latters. The nature of the free ventricular endings of the neurons and the possible function of the PVO are discussed in the text.
Original language | English |
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Pages (from-to) | 229-245 |
Number of pages | 17 |
Journal | Zeitschrift für Zellforschung und Mikroskopische Anatomie |
Volume | 80 |
Issue number | 2 |
DOIs | |
Publication status | Published - Jun 1967 |
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ASJC Scopus subject areas
- Anatomy
- Clinical Biochemistry
- Cell Biology
- Medicine(all)
Cite this
Electron microscopy of the paraventricular organ in the sparrow (Passer domesticus). / Röhlich, P.; Vígh, B.
In: Zeitschrift für Zellforschung und Mikroskopische Anatomie, Vol. 80, No. 2, 06.1967, p. 229-245.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Electron microscopy of the paraventricular organ in the sparrow (Passer domesticus)
AU - Röhlich, P.
AU - Vígh, B.
PY - 1967/6
Y1 - 1967/6
N2 - Characteristics of the ependymal cells of the Paraventricular Organ (PVO) in the sparrow are strongly dilated ergastoplasmic cisternae filled with a moderately dense substance, the absence of cilia and a long basal process ending around capillaries. Elongated cells having a pale cytoplasm ("light cells") are interposed between the ependymal cells. These cells protrude into the ventricle lumen with a bulbous cytoplasmic swelling; centrioles and several dense-core vesicles occur frequently in them. Two types of nerve cells have been identified in the PVO. The more superficial cells - called type-I neurons have a dendrite-like process which, after passing the ependymal layer reach the ventricle surface and end there freely with a bulbous swelling ("club"). The whole neuron contains dense-core vesicles of an average diameter of 840 Å; the extensive Golgi region is located in the dendrite. The larger type-II neurons situated in the deeper layers show a folded nuclear membrane, large mitochondria and rarely dense-core vesicles; the Golgi apparatus is enclosed in the perikaryon. The nerve cells are embedded in a feltwork of glial and neural processes the latters showing often synaptic (axodendritic) junctions. The majority of the synapses are supposed to occur between the axon-like processes of the typeI neuron and dendrites of the type-II neuron. Axo-somatic synapses can be found not infrequently on the perikarya of the latters. The nature of the free ventricular endings of the neurons and the possible function of the PVO are discussed in the text.
AB - Characteristics of the ependymal cells of the Paraventricular Organ (PVO) in the sparrow are strongly dilated ergastoplasmic cisternae filled with a moderately dense substance, the absence of cilia and a long basal process ending around capillaries. Elongated cells having a pale cytoplasm ("light cells") are interposed between the ependymal cells. These cells protrude into the ventricle lumen with a bulbous cytoplasmic swelling; centrioles and several dense-core vesicles occur frequently in them. Two types of nerve cells have been identified in the PVO. The more superficial cells - called type-I neurons have a dendrite-like process which, after passing the ependymal layer reach the ventricle surface and end there freely with a bulbous swelling ("club"). The whole neuron contains dense-core vesicles of an average diameter of 840 Å; the extensive Golgi region is located in the dendrite. The larger type-II neurons situated in the deeper layers show a folded nuclear membrane, large mitochondria and rarely dense-core vesicles; the Golgi apparatus is enclosed in the perikaryon. The nerve cells are embedded in a feltwork of glial and neural processes the latters showing often synaptic (axodendritic) junctions. The majority of the synapses are supposed to occur between the axon-like processes of the typeI neuron and dendrites of the type-II neuron. Axo-somatic synapses can be found not infrequently on the perikarya of the latters. The nature of the free ventricular endings of the neurons and the possible function of the PVO are discussed in the text.
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UR - http://www.scopus.com/inward/citedby.url?scp=0014186746&partnerID=8YFLogxK
U2 - 10.1007/BF00337459
DO - 10.1007/BF00337459
M3 - Article
C2 - 5592803
AN - SCOPUS:0014186746
VL - 80
SP - 229
EP - 245
JO - Cell and Tissue Research
JF - Cell and Tissue Research
SN - 0302-766X
IS - 2
ER -