Fiber connections of the periventricular pretectal nucleus in a teleost
 tilapia (Oreochromis niloticus)

Hao-Gang Xue
Chun-Ying Yang
Naoyuki Yamamoto
Hitoshi Ozawa

Fiber connections of the periventricular pretectal nucleus were studied by a tract-tracing method in a teleost
 tilapia. After tracer injections into the periventricular pretectal nucleus
 labeled neurons were observed ipsilaterally in the area pretectalis pars ventralis
 area pretectalis pars dorsalis
 optic tectum and ventrolateral nucleus of semicircular torus
 bilaterally in the ventromedial thalamic nucleus
 principal sensory trigeminal nucleus and descending trigeminal nucleus
 and contralaterally in the periventricular pretectal nucleus and corpus cerebelli. Two types of tectal neurons were labeled in the stratum album centrale and the stratum periventriculare. The somata in the stratum album centrale were large and oval or multipolar. The somata in the stratum periventriculare were pyriform with an apical dendrite that ramified at the boundary zone between the stratum griseum centrale and stratum fibrosum et griseum superficiale. Anterogradely labeled terminals were present in the ipsilateral area pretectalis pars dorsalis
 optic tectum and corpus cerebelli
 the bilateral ventromedial thalamic nucleus
 lateral valvular nucleus
 oculomotor nucleus and inferior olive
 and the contralateral periventricular pretectal nucleus. The present study suggests that the periventricular pretectal nucleus conveys somatosensory and mechanosensory lateral line inputs in addition to the visual information to the cerebellum. c 2006 Elsevier Ireland Ltd and the Japan Neuroscience Society.

Neuroscience Research

57

2

10.1016/j.neures.2006.10.004

https://doi.org/10.1016/j.neures.2006.10.004
https://www.ncbi.nlm.nih.gov/pubmed/17097753