Premium
Afferent sources to the ganglion of the terminal nerve in teleosts
Author(s) -
Yamamoto Naoyuki,
Ito Hironobu
Publication year - 2000
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 - 10.1002/1096-9861(20001211)428:2<355::aid-cne12>3.0.co;2-w
Subject(s) - locus coeruleus , biology , nucleus , anatomy , diencephalon , afferent , neuroscience , central nervous system
Afferent sources to the ganglion (ggl) of the terminal nerve (TN) were studied in percomorph teleosts the tilapia and dwarf gourami. After tracer applications to the TN‐ggl and the surrounding bulbus olfactorius, retrogradely labeled neurons were present in the area dorsalis telencephali pars posterior (Dp), area ventralis telencephali pars ventralis et supracommissuralis (Vv and Vs), nucleus tegmento‐olfactorius of Prasada Rao and Finger (1984), and locus coeruleus. In the contralateral bulbus olfactorius labeled cells were observed, and terminals were seen in the TN‐ggl. Tracer injection experiments to the possible sources of origin to the TN‐ggl were then performed. Tracer applications to the nucleus tegmento‐olfactorius labeled abundant terminals in the TN‐ggl but labeled very few in the bulbus olfactorius proper. Retrogradely labeled neurons were present in the nucleus ventromedialis thalami, nucleus commissurae posterioris, area pretectalis pars dorsalis et ventralis, nucleus sensorius nervi trigemini, and formatio reticularis pars superius et medius. Tracer applications to the Dp or Vs/Vv labeled terminals mainly in the bulbus olfactorius proper. However, terminals to the TN‐ggl were supplied from labeled axons on their way to the bulbus olfactorius. Tracer injections to the locus coeruleus labeled only a few fibers around the TN‐ggl. These results suggest that the TN‐ggl receives somatosensory and visual inputs from the nucleus tegmento‐olfactorius and olfactory inputs from the bulbus olfactorius and telencephalic subdivisions, which receive secondary olfactory projections. The locus coeruleus may also send fibers to the TN‐ggl. J. Comp. Neurol. 428:355–375, 2000. © 2000 Wiley‐Liss, Inc.