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Table of Contents
Vol. 163, No. 3, 1998
Issue release date: 1998
Section title: Paper
Acta Anat 1998;163:157–172
(DOI:10.1159/000046494)

The Neural Substrate for ‘Learned’ and ‘Nonlearned’ Activities in Birds: A Discussion of the Organization of Bulbar Reticular Premotor Systems with Side-Lights on the Mammalian Situation

Dubbeldam J.L.
Institute of Evolutionary and Ecological Sciences, Leiden University, Leiden, The Netherlands

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Article / Publication Details

First-Page Preview
Abstract of Paper

Published online: February 24, 1999
Issue release date: 1998

Number of Print Pages: 16
Number of Figures: 10
Number of Tables: 2

ISSN: 1422-6405 (Print)
eISSN: 1422-6421 (Online)

For additional information: http://www.karger.com/CTO

Abstract

The reticular formation of the brainstem contains premotor systems for various musculomotor systems. In this paper, the bulbar premotor systems for jaw and tongue movements, head and neck movements, locomotion, and respiration and vocalization in birds are reviewed and compared to premotor systems in mammals. Roughly, the bulbar reticular formation can be subdivided in three longitudinal zones: a dorsolateral (RPcdl) and a ventromedial (RPcvm) parvocellular zone and a gigantocellular zone (RGc). RPcdl contains premotor neurons for the jaw and neck system, RPcvm for the jaw, tongue and neck system, and RGc for the tongue and locomotory system. RPcdl receives input from the descending sensory trigeminal system, parts of RPcvm and RGc from vestibular nuclei, whereas the tectum has a projection to the contralateral RGc. RPcdl and RPcvm receive substantial telencephalic input through the occipitomesencephalic tract. The bulbar part of the respiratory system consists of a series of cell groups in the ventrolateral reticular formation and has connections with motor centers of the vocalization system. The similarities and differences between the avian and mammalian situation are discussed. Musculomotor systems participate in various activities. It is argued that a premotor system should possess sufficient flexibility to control the participation of a motor system in the different activities. This flexibility may permit the occurrence of learning processes in terms of refining basically existing motor patterns. The emergence of new and more complex motor patterns as in vocalization requires the involvement of hierarchically higher brain centers.


Article / Publication Details

First-Page Preview
Abstract of Paper

Published online: February 24, 1999
Issue release date: 1998

Number of Print Pages: 16
Number of Figures: 10
Number of Tables: 2

ISSN: 1422-6405 (Print)
eISSN: 1422-6421 (Online)

For additional information: http://www.karger.com/CTO


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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.
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