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ID 16985
Eprint ID
16985
FullText URL
Thumnail 92_137.pdf 1.98 MB
Title Alternative
An experimental-anatomical study on the auditory tectothalamic projections
Author
Yamawaki, Masaomi
Abstract
The present study has been undertaken to clarify the ascending projections of the inferior colliculus (IC) to the posterior thalamus, particularly the medical geniculate body (MGB), using the Nauta-Gygax and Fink-Heimer methods. The ventrolateral part of the central nucleus of IC projects mainly to the laminated ventral principal part and the lateral portion of the magnocelluar part of MGB. The projections to the laminated ventral principal part are topically organized mediolaterally, i.e., the medial laminae of the central nucleus of IC project to the medial laminae of the ventral principal part of MGB, whereas the more lateral laminae of the central nucleus send fibers to the more lateral laminae of the ventral principal part of MGB. The projections of the central nucleus of IC to the laminated ventral principal part of MGB also appear to be organized anteroposteriorly and dorsoventrally. The dorsomedial part of the central nucleus of IC projects to the ventromedial portion of the ventral principal part, the magnocellular part, and the ventral portion of the dorsal principal part of MGB. The external nucleus of IC is situated lateral to the central nucleus and extends anteriorly to form the anterior extremity of IC. It projects to the magnocellular and ventral principal parts and to the ventral portion of the dorsal principal part of MGB, including the deep dorsal nucleus of Morest (1964). In addition, it sends fibers to the deeper layers of the superior colliculus (stratum griseum intermediale and profundum) and to the anterior pretectal and suprageniculate nuclei. The inferior colliculus projects to the nucleus of the brachium of the inferior colliculus and the interstitial nucleus of the inferior brachium and to the central gray of the midbrain. Each part of IC is connected with other parts by intrinsic fibers. IC sends fibers to the dorsal part of the contralateral inferior colliculus, particularly the dorsomedial part of the central nucleus, through the commissure of the inferior colliculus. Only a few fibers pass by way of the inferior brachium to MGB on the contralateral side.
Keywords
聴覚系
繊維投射
視床
Published Date
1980-02-28
Publication Title
岡山医学会雑誌
Publication Title Alternative
Journal of Okayama Medical Association
Volume
volume92
Issue
issue1-2
Publisher
岡山医学会
Publisher Alternative
Okayama Medical Association
Start Page
137
End Page
152
ISSN
0030-1558
NCID
AN00032489
Content Type
Journal Article
Official Url
https://www.jstage.jst.go.jp/article/joma1947/92/1-2/92_1-2_137/_article/-char/ja/
Related Url
http://www.okayama-u.ac.jp/user/oma/index.html
language
日本語
Copyright Holders
岡山医学会
File Version
publisher
Refereed
True
Eprints Journal Name
joma