Primary and secondary sensory trigeminal projections were studied by means of tract-tracing methods in a cyprinid teleost
the carp. Tracer injections into the trigeminal nerve root labeled terminals in the ipsilateral principal sensory trigeminal nucleus
descending trigeminal nucleus
medial funicular nucleus
facial lobe
and medial part of posterior lateral valvular nucleus. The principal sensory trigeminal nucleus is considered a major origin of the secondary sensory trigeminal projections in teleosts. To investigate the secondary sensory trigeminal projections
tracer injections were performed into the principal sensory trigeminal nucleus. The present study suggests that the principal sensory trigeminal nucleus projects to the bilateral ventromedial thalamic nucleus
periventricular pretectal nucleus
stratum album centrale of the optic tectum
caudomedial region of lateral preglomerular nucleus
ventrolateral nucleus of semicircular torus
medial part of rostral and posterior lateral valvular nucleus
oculomotor nucleus
trochlear nucleus
trigeminal motor nucleus
facial motor nucleus
superior and inferior reticular formation
descending trigeminal nucleus
medial funicular nucleus
inferior olive
and to the contralateral sensory trigeminal nucleus. These observations indicate that the primary and secondary trigeminal sensory projections of a cyprinid teleost
the carp
are similar to those in percomorph teleosts. c 2006 Wiley-Liss
Inc.
