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II. Physiological Effects and Anatomical Degeneration Resulting from Lesions in the Medial Longitudinal Fasciculus

MALCOLM B. CARPENTER, M.D.; ROBERT E. McMASTERS, M.D.

Arch Neurol. 1963;8(4):347-368.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

Since conjugate deviation of the eyes in a horizontal plane involves simultaneous contraction of the medial rectus muscle of one eye and the lateral rectus muscle of the other eye, some neural pathway between the nuclei of the extraocular muscles must provide for this synergistic action. While it has been suggested by many authors that fibers from the abducens or parabducens nucleus⁶⁴ may ascend in the medial longitudinal fasciculus to the trochlear and oculomotor nuclei, these fibers have not been demonstrated. The principal ascending fibers in the medial longitudinal fasciculus rostral to the abducens nuclei originate from the vestibular nuclei. It is commonly acknowledged that the vestibular nuclei project fibers and/or collaterals to all of the nuclei of the extraocular muscles.^8,14 The hypothesis that the secondary vestibular projection may play an essential rôle in all conjugate eye movements is strengthened by the experimental studies of Fluur,³¹ . . . [Full Text PDF of this Article]

Author Affiliations
NEW YORK

Department of Anatomy, College of Physicians and Surgeons, Columbia University.

Footnotes
Submitted for publication Oct. 15, 1962.

Postdoctoral trainee in neuroanatomy supported by Grant 2B-5242 (C2) from the Institute of Neurological Diseases and Blindness (Dr. McMasters).

Supported by research grants (B-1538 C4 and B-1630 C3) from the Institute of Neurological Diseases and Blindness of the National Institutes of Health, Bethesda 14, Md.

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