PMID- 7172215 OWN - NLM STAT- MEDLINE DCOM- 19830214 LR - 20190720 IS - 0302-766X (Print) IS - 0302-766X (Linking) VI - 227 IP - 1 DP - 1982 TI - Synaptology of neurosecretory cells in the nucleus paraventricularis of the domestic fowl. PG - 79-92 AB - Processes of magnocellular neurosecretory cells (MNCs) are easily identifiable on the basis of their content in neurosecretory granules in the neuropil of the rostral division of the paraventricular nucleus (PVN) of the domestic fowl. In specimens sacrificed during the winter the synaptic organization of the neuropil and the pattern of synapses ending on neurosecretory processes were studied at the ultrastructural level. Synapses in the rostral part of the PVN neuropil may be divided into three main categories on the basis of their morphology and their content of clear and dense-core synaptic vesicles. These different types of terminals can be attributed to aminergic, peptidergic or other types of synapses. The percent distribution of synapses within these categories differs when all synapses observed in the neuropil or only those ending on MNC processes are compared. Present ultrastructural data obtained in birds support two physiological hypotheses already suggested for mammals, i.e., the probable existence of a recurrent pathway to MNCs via an interneuron, and the importance of aminergic and peptidergic input in regulating the electrical activity ov MNCs. FAU - Panzica, G C AU - Panzica GC FAU - Viglietti-Panzica, C AU - Viglietti-Panzica C FAU - Contenti, E AU - Contenti E LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - Germany TA - Cell Tissue Res JT - Cell and tissue research JID - 0417625 SB - IM MH - Animals MH - Axons/ultrastructure MH - Chickens/*anatomy & histology MH - Dendrites/ultrastructure MH - Female MH - Male MH - Microscopy, Electron MH - Neurosecretory Systems/*ultrastructure MH - Organoids/ultrastructure MH - Paraventricular Hypothalamic Nucleus/*ultrastructure MH - Synapses/*ultrastructure MH - Synaptic Vesicles/ultrastructure EDAT- 1982/01/01 00:00 MHDA- 1982/01/01 00:01 CRDT- 1982/01/01 00:00 PHST- 1982/01/01 00:00 [pubmed] PHST- 1982/01/01 00:01 [medline] PHST- 1982/01/01 00:00 [entrez] AID - 10.1007/BF00206333 [doi] PST - ppublish SO - Cell Tissue Res. 1982;227(1):79-92. doi: 10.1007/BF00206333.