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Thalamic fiber connections in a teleost ( Sebastiscus marmoratus ): Visual somatosensory, octavolateral, and cerebellar relay region to the telencephalon
Author(s) -
Ito Hironobu,
Murakami Takeshi,
Fukuoka Toshio,
Kishida Reiji
Publication year - 1986
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.902500208
Subject(s) - biology , anatomy , cerebrum , thalamus , cytoarchitecture , neuroscience , tectum , diencephalon , brainstem , somatosensory system , nucleus , midbrain , central nervous system
Fiber connections of the nucleus ventromedialis thalami (VM) of Schnitzlein ( J. Comp. Neurol. 118 :225–267, '62) in a teleost ( Sebastiscus marmoratus ) were examined by means of the horseradish peroxidase (HRP) tracing method. This nucleus receives fibers from the ipsilateral telencephalon (area dorsalis pars centralis), contralateral retina, contralateral VM, ipsilateral optic tectum, ipsilateral torus semicircularis, contralateral corpus cerebelli, contralateral sensory nucleus of the trigeminal nerve, bilateral bulbospinal reticular formation, contralateral obex region, and contralateral dorsal portion of upper spinal segments. In turn, axons arising from VM terminate in the dorsal telencephalic areas (pars centralis, pars dorsalis, and pars medialis) ipsilaterally, ventral telencephalic area (pars supracommissuralis) bilaterally, nucleus prethalamicus of Meader ( J. Comp. Neurol. 60 :361–407, '34) bilaterally, nucleus dorsomedialis thaiami bilaterally, VM contralaterally, optic tectum bilaterally, torus semicircularis bilaterally, and nucleus lateralis valvulae ipsilaterally. Based on the cytoarchitecture and fiber connections, VM is subdivided into rostral and caudal components. The caudal part of VM in Sebastiscus is considered to be a multimodal thalamic complex that contains some cells that constitute the dorsal thalamus in other vertebrate groups.