Premium
Afferents to the optic tectum of the leopard frog: An HRP study
Author(s) -
Wilczynski Walt,
Northcutt R. Glenn
Publication year - 1977
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.901730202
Subject(s) - pretectal area , tectum , anatomy , biology , neuropil , nucleus , midbrain , efferent , neuroscience , tegmentum , superior colliculus , optic tract , thalamus , dorsal column nuclei , spinal cord , central nervous system , optic nerve , afferent
Folowing unilateral HRP injections in the optic tectum of Ran pipiens , HRP ‐ positive cells were seen in three pretectal nuclei: bilaterally in the dorsal posterior nucleus; in the dorsal half of the ipsilateral posterior nucleus; and ipsilaterally in the large‐celled pretectal nucleus. HRP ‐positive cells were also seen ipsilaterally in the anterodorsal, posterodorsal and posteroventral tegmental fields, the nucleus isthmi, and the dorsal gray columns of the cervical spinal cord; bilaterally in the suprapeduncular nucleus, a paramedian cell group dorsal to the interpeduncular nucleus; and in the deep layers of the contralateral tectum. In addition, evidence for a bilateral ventral preopto‐tectal projection was seen in half the experimental animals. No tectal afferents from telencephalic or rostral thalamic areas were seen. Both the ascending and descending tectal efferent fibers were also filled with reaction product. The pale reaction indicative of terminating tectal efferents was seen in the dorsal pretectum, partially overlapping the lateral nucleus and uncinate neuropil; in the core of nucleus isthmi; and in the superior olive.