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The motor nuclei and sensory neurons of the IIIrd, IVth, and VIth cranial nerves in the monitor lizard, Varanus exanthematicus.
J Comp Neurol. 1988 Jan 15; 267(3):370-86.JC

Abstract

The motor nuclei of the oculomotor, trochlear, and abducens nerves of the reptile Varanus exanthematicus and the neurons that subserve the sensory innervation of the extraocular muscles were identified and localized by retrograde and anterograde transport of horseradish peroxidase (HRP). The highly differentiated oculomotor nuclear complex, located dorsomedially in the tegmentum of the midbrain, consists of the accessory oculomotor nucleus and the dorsomedial, dorsolateral, intermediate, and ventral subnuclei. The accessory oculomotor nucleus projects ipsilaterally to the ciliary ganglion. The dorsomedial, dorsolateral, and intermediate subnuclei distribute their axons to the ipsilateral orbit, whereas the ventral subnucleus, which innervates the superior rectus muscle, has a bilateral, though predominantly contralateral projection. The trochlear nucleus, which rostrally overlaps the oculomotor nuclear complex, is for the greater part a comma-shaped cell group situated lateral, dorsal, and medial to the medial longitudinal fasciculus. Following HRP application to the trochlear nerve, almost all retrogradely labeled cells were found in the contralateral nucleus. The nuclear complex of the abducens nerve consists of the principal and accessory abducens nuclei, both of which project ipsilaterally. The principal abducens nucleus is located just beneath the fourth ventricle laterally adjacent to the medial longitudinal fasciculus and innervates the posterior rectus muscle. The accessory abducens nucleus has a ventrolateral position in the brainstem in close approximation to the ophthalmic fibers of the descending trigeminal tract. It innervates the retractor bulbi and bursalis muscles. The fibers arising in the accessory abducens muscles form a loop in or just beneath the principal abducens nucleus before they join the abducens nerve root. The afferent fibers conveying sensory information from the extraocular muscles course in the oculomotor nerve and have their perikarya in the ipsilateral trigeminal ganglion, almost exclusively in its ophthalmic portion.

Authors+Show Affiliations

Department of Anatomy and Embryology, Vrije Universiteit, Amsterdam, The Netherlands.No affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

3343406

Citation

Barbas-Henry, H A., and A H. Lohman. "The Motor Nuclei and Sensory Neurons of the IIIrd, IVth, and VIth Cranial Nerves in the Monitor Lizard, Varanus Exanthematicus." The Journal of Comparative Neurology, vol. 267, no. 3, 1988, pp. 370-86.
Barbas-Henry HA, Lohman AH. The motor nuclei and sensory neurons of the IIIrd, IVth, and VIth cranial nerves in the monitor lizard, Varanus exanthematicus. J Comp Neurol. 1988;267(3):370-86.
Barbas-Henry, H. A., & Lohman, A. H. (1988). The motor nuclei and sensory neurons of the IIIrd, IVth, and VIth cranial nerves in the monitor lizard, Varanus exanthematicus. The Journal of Comparative Neurology, 267(3), 370-86.
Barbas-Henry HA, Lohman AH. The Motor Nuclei and Sensory Neurons of the IIIrd, IVth, and VIth Cranial Nerves in the Monitor Lizard, Varanus Exanthematicus. J Comp Neurol. 1988 Jan 15;267(3):370-86. PubMed PMID: 3343406.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The motor nuclei and sensory neurons of the IIIrd, IVth, and VIth cranial nerves in the monitor lizard, Varanus exanthematicus. AU - Barbas-Henry,H A, AU - Lohman,A H, PY - 1988/1/15/pubmed PY - 1988/1/15/medline PY - 1988/1/15/entrez SP - 370 EP - 86 JF - The Journal of comparative neurology JO - J. Comp. Neurol. VL - 267 IS - 3 N2 - The motor nuclei of the oculomotor, trochlear, and abducens nerves of the reptile Varanus exanthematicus and the neurons that subserve the sensory innervation of the extraocular muscles were identified and localized by retrograde and anterograde transport of horseradish peroxidase (HRP). The highly differentiated oculomotor nuclear complex, located dorsomedially in the tegmentum of the midbrain, consists of the accessory oculomotor nucleus and the dorsomedial, dorsolateral, intermediate, and ventral subnuclei. The accessory oculomotor nucleus projects ipsilaterally to the ciliary ganglion. The dorsomedial, dorsolateral, and intermediate subnuclei distribute their axons to the ipsilateral orbit, whereas the ventral subnucleus, which innervates the superior rectus muscle, has a bilateral, though predominantly contralateral projection. The trochlear nucleus, which rostrally overlaps the oculomotor nuclear complex, is for the greater part a comma-shaped cell group situated lateral, dorsal, and medial to the medial longitudinal fasciculus. Following HRP application to the trochlear nerve, almost all retrogradely labeled cells were found in the contralateral nucleus. The nuclear complex of the abducens nerve consists of the principal and accessory abducens nuclei, both of which project ipsilaterally. The principal abducens nucleus is located just beneath the fourth ventricle laterally adjacent to the medial longitudinal fasciculus and innervates the posterior rectus muscle. The accessory abducens nucleus has a ventrolateral position in the brainstem in close approximation to the ophthalmic fibers of the descending trigeminal tract. It innervates the retractor bulbi and bursalis muscles. The fibers arising in the accessory abducens muscles form a loop in or just beneath the principal abducens nucleus before they join the abducens nerve root. The afferent fibers conveying sensory information from the extraocular muscles course in the oculomotor nerve and have their perikarya in the ipsilateral trigeminal ganglion, almost exclusively in its ophthalmic portion. SN - 0021-9967 UR - https://www.unboundmedicine.com/medline/citation/3343406/The_motor_nuclei_and_sensory_neurons_of_the_IIIrd_IVth_and_VIth_cranial_nerves_in_the_monitor_lizard_Varanus_exanthematicus_ L2 - https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0021-9967&date=1988&volume=267&issue=3&spage=370 DB - PRIME DP - Unbound Medicine ER -