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Evaluation of a surgical method for immobilizing the eye of an alert monkey


Experimental Brain Research 31(2): 179-192
Evaluation of a surgical method for immobilizing the eye of an alert monkey
One eye of a macaque monkey [Macaca fascicularis] was immobilized by severing the 3rd, 4th and 6th cranial nerves. The residual movements of the operated eye were measured by repeatedly mapping the position of a visual receptive field. Movements of several degrees were caused by contraction of the orbital musculature during the closure blink. The amount of movement was dramatically reduced by paralysis of the superficial orbital muscles with a local anesthetic. Side effects of surgical immobilization include increased risk of corneal clouding and eye infection. In 1 monkey intraocular pressure was lowered for several weeks. Regeneration of the severed nerves caused return of some voluntary eye movements, which were not coordinated with movements of the unoperated eye even after 9 mo. postoperative survival. The suitability of this approach for studies on the visual nervous system was discussed.

Accession: 005395765

PMID: 415895

DOI: 10.1007/bf00237598

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