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Synaptology of luteinizing hormone‐releasing hormone (LHRH)‐immunoreactive cells in the nervus terminalis of the gray short‐tailed opossum ( monodelphis domestica )
Author(s) -
Zheng LiMou,
Pfaff Donald W.,
SchwanzelFukuda Marlene
Publication year - 1990
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.902950213
Subject(s) - biology , monodelphis domestica , opossum , immunocytochemistry , terminal nerve , neuroscience , axon , anatomy , forebrain , ganglion , endocrinology , central nervous system , hormone
Abstract Light and electron microscopic immunocytochemistry were used to examine the structure of LHRH neurons and fibers in the nervus terminalis of the gray short‐tailed opossum ( Monodelphis domestica ). LHRH‐immunoreactive neurons and fibers form a loose plexus within the fascicular network of the ganglion terminale on the median surface of the olfactory bulb. There are at least two populations of LHRH‐immunoreactive neurons within the network of the ganglion terminale: fusiform and round neurons similar to those described in the forebrain. At the ultrastructural level, axosomatic and axodendritic contacts were seen between LHRH‐immunoreactive and nonimmunoreactive elements in the ganglion terminale. These contacts were classified as (1) synaptic input, with asymmetric synapses seen between a nonimmunoreactive axon terminal and a LHRH‐immunoreactive cell body or a nonimmunoreactive axon terminal and a LHRH‐immunoreactive dendritic process. (2) synaptic output, with symmetric synapses seen between LHRH‐immunoreactive and nonimmunoreactive processes. This study is the first systematic examination of the ultrastructure of the LHRH‐immunoreactive neurons and their synaptic contacts in the nervus terminalis. The possible integrative roles for this LHRH‐immunoreactive system are discussed.