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Topographic atlas of somatostatin‐containing neuron system in the avian brain in relation to catecholamine‐containing neuron system. I. Telencephalon and diencephalon
Author(s) -
Takatsuki Kenichi,
Shiosaka Sadao,
Inagaki Shinobu,
Sakanaka Masahiro,
Takagi Hiroshi,
Senba Emiko,
Matsuzaki Takashi,
Tohyama Masaya
Publication year - 1981
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.902020109
Subject(s) - cerebrum , diencephalon , forebrain , biology , hypothalamus , median eminence , somatostatin , neuron , catecholamine , medicine , endocrinology , central nervous system , anatomy , neuroscience
The morphological organization of the somatostatin (SRIF)‐positive neurons in the forebrain (telencephalon and diencephalon) of the warbling grass parakeet (Melopsittacus undulatus) was studied using the indirect immunohistochemical technique of Coons and co‐workers ('58). In the telencephalon, a number of SRIF‐positive neurons was detected in the lobus paraolfactorius, hippocampus, and paleostriatum. Furthermore, scattered SRIF‐labeled cells were noticed in the area corticoidea dorsolateralis and area temporoparieto‐occipitalis. A moderate density of immunoreactive fibers was found in the above areas. In addition, although the septal area was devoid of SRIF‐positive neurons, this area contained a moderate number of SRIF‐positive fibers. A large number of SRIF‐positive neurons occurred in the following hypothalamic areas: (1) nucleus medialis hypothalami posterior, (2) lateral hypothalamus, and (3) mammillary nucleus. The bird hypothalamus also received a strikingly massive SRIF innervation. The heaviest concentration of SRIF‐labeled fibers was detected in the median eminence. Many SRIF‐labeled fibers were also observed in other hypothalamic regions. Their locations roughly corresponded in many cases to the areas in which SRIF‐positive neurons were disclosed. The overall distribution of the catecholamine system (CA) of the avian forebrain is also presented by means of histofluorescent technique. A possible interaction between SRIF and CA neuron systems is briefly discussed.