The inferior colliculus is a nucleus of obligatory synapse in the ascending brain stem auditory pathways. Projections from the inferior colliculus in primates and insectivores are similar to that demonstrated in other mammals, with short direct projections to the external nucleus of the colliculus and adjacent regions of the central gray and superior colliculus ipsilaterally, and fibers crossing in the commissure of the colliculus to innervate the contralateral central and external nuclei. Long projection fibers enter the brachium of the inferior colliculus bilaterally, but the projection is markedly heavier on the side ipsilateral to the lesion. Brachial fibers supply terminals to two regions of the rostral midbrain tegmentum, the parabrachial area and the interstitial nucleus of the inferior brachium. On reaching the thalamus, brachial fibers bypass the caudal tip of the medial geniculate, but arborize to form a dense plexus of axons and terminals throughout the remainder of the principal nucleus of the geniculate and the entire internal division on the ipsilateral side. A lighter and more restricted projection to the opposite medial geniculate is seen in all primates, and particularly in the hedgehog. The small size of the contralateral tectothalamic pathway in the hedgehog is the only significant species difference noted in this study.

Keywords:
Primates, Insectivores, Auditory system, Inferior colliculus, Medial geniculate
This content is only available via PDF.
© 1977 S. Karger AG, Basel
1977
Copyright / Drug Dosage / Disclaimer
Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher.
Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.
You do not currently have access to this content.