Document Detail

The motor complex and primary projections of the trigeminal nerve in the monitor lizard, Varanus exanthematicus.
MedLine Citation:
PMID:  3794009     Owner:  NLM     Status:  MEDLINE    
The sensory projections and the motor complex of the trigeminal nerve of the reptile Varanus exanthematicus were studied with the methods of anterograde degeneration and anterograde and retrograde axonal transport. The primary afferent fibers diverge in the brainstem into a short ascending and a long descending tract. The former distributes its fibers to the principal sensory trigeminal nucleus, where nerves V1, V2, and V3 are represented along a lateromedial axis. The fibers of the descending tract enter the nucleus of this tract and the reticular formation. Both in the tract and its nucleus, nerves V1, V2 and V3 occupy successively more dorsal positions. A small contingent of nerve V1 fibers course to the accessory abducens nucleus. The descending tract extends caudally into the first and second cervical segments of the spinal cord. The trigeminal motor complex consists of dorsal, ventral, and dorsomedial nuclei. The m. adductor mandibulae externus (the main jaw closer) is represented in the dorsal nucleus, predominantly in its rostral part. The muscles innervated by nerve V3 are represented in the ventral nucleus, mainly in its caudal part. All three divisions of the trigeminal nerve contain peripheral branches of the mesencephalic trigeminal system. Collaterals of the central branches of this system were traced to the ventral motor and the principal sensory trigeminal nuclei.
H A Barbas-Henry; A H Lohman
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of comparative neurology     Volume:  254     ISSN:  0021-9967     ISO Abbreviation:  J. Comp. Neurol.     Publication Date:  1986 Dec 
Date Detail:
Created Date:  1987-02-19     Completed Date:  1987-02-19     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0406041     Medline TA:  J Comp Neurol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  314-29     Citation Subset:  IM    
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MeSH Terms
Brain Mapping
Horseradish Peroxidase
Lizards / anatomy & histology*,  physiology
Motor Neurons / physiology*
Neural Pathways / anatomy & histology
Neurons, Afferent / physiology*
Trigeminal Nerve / anatomy & histology*,  physiology
Reg. No./Substance:
EC 1.11.1.-/Horseradish Peroxidase

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