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Ascending connections of the anterior ventral cochlear nucleus in the rat

✍ Scribed by J. M. Harrison; R. Irving

Publisher
John Wiley and Sons
Year
1966
Tongue
English
Weight
863 KB
Volume
126
Category
Article
ISSN
0021-9967

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✦ Synopsis

The purpose of the experiment was to determine the connections of the three regions of the anterior vcntral cochlear nucleus in the rat. Lesions were placed in the regions of the nucleus in 11 rats. After 25 days each animal was sacrificed and its brain impregnated by the protargol method of Bodian. The superior olivary complex, the lateral lemniscus and the dorsal acoustic stria were examined for diminution of synaptic endings, thinning of neuropil and debris of degeneration.

Complete destruction of region I11 of the anterior ventral cochlear nucleus produced degeneration in the ipsilateral lateral superior olive and in the medial superior olive of both sides. Destruction of other regions of the anterior ventral cochlear nucleus, region 111 remaining intact, had no effect upon the lateral or medial superior olive.

Destruction of region I1 of the anterior ventral cochlear nucleus produced degeneration in the anterior halves of the ipsilateral lateral nucleus of the trapezoid body and the contralateral medial nucleus of the trapezoid body. Complete destruction of other regions of the anterior ventral cochlear nucleus, region I1 remaining intact, was without effect upon the lateral and medial nuclei of the trapezoid body.

No degeneration was detected following destruction of region I of the anterior ventral cochlear nucleus.

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