Journalartikel

Jahr der Veröffentlichung: 1975

Seiten: 419-438

Zeitschrift: Cell and Tissue Research

Bandnummer: 162

Heftnummer: 4

ISSN: 0302-766X

eISSN: 1432-0878

Verlag: Springer

Abstract: 
The fine structure of the parvocellular truberal nuclei and that of the ependyma bordering the third ventricle in the basal hypothalamus of the white-crowned sparrow, were investigated. Photoperiodically stimulated birds were compared with birds held on short days. The perikarya of the neurons of the basal infundibular (tuberal) nucleus, and in part, of the more dorsal layers contain dense-cored granules (1000-1500 .ANG.). The granules in the anterior part of the nucleus are somewhat larger than those of the posterior part. The synapses and the synaptic relationships of these cells are described. The single-layered ependyma of the third ventricle in the basal hypothalamus may be divided into the dorsal typical ependyma, the ventrolateral glandular ependyma, and the ventral glandular ependyma. Cells of the ventral ependyma lack apical cilia but bear a few microvillous processes. They have well-developed Golgi apparatus, conspicuous polysomes, and frequently dense, irregularly-shaped granules. Basal cytoplasmic processes extend ventrally to the outer surface of the median eminence. Photoperiodic stimulation appears to increase the numbers of apical protrusions of the cells in the ventral glandular ependyma and to cause an increase in size of the nerve cells of the basal infundibular nucleus.

Harvard-Zitierstil: MIKAMI, S., OKSCHE, A., FARNER, D. and YOKOYAMA, K. (1975) FINE-STRUCTURE OF HYPOTHALAMIC SECRETORY NEURONS OF WHITE-CROWNED SPARROW, ZONOTRICHIA-LEUCOPHYRS-GAMBELII (PASSERIFORMES-FRINGILLIDAE) .1. PARVOCELLULAR TUBERAL NUCLEI, Cell and Tissue Research, 162(4), pp. 419-438

APA-Zitierstil: MIKAMI, S., OKSCHE, A., FARNER, D., & YOKOYAMA, K. (1975). FINE-STRUCTURE OF HYPOTHALAMIC SECRETORY NEURONS OF WHITE-CROWNED SPARROW, ZONOTRICHIA-LEUCOPHYRS-GAMBELII (PASSERIFORMES-FRINGILLIDAE) .1. PARVOCELLULAR TUBERAL NUCLEI. Cell and Tissue Research. 162(4), 419-438.