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(Investigative Ophthalmology and Visual Science. 1974;13:879-882.)
© 1974 by The Association for Research in Vision and Ophthalmology, Inc.

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Activation of Slow Motor Units by Threshold Stimulation of Cat Eye Muscle nerves

GUNNAR LENNERSTRAND 1 and PAUL BACH-Y-RITA 2

1 Smith-Kettlewell Institute of Visual Sciences, 2232 Webster St., San Francisco, Calif. 94115; The Eye Clinic, Karolinska Hospital, S-104 01, Stockholm 60, Sweden
2 Smith-Kettlewell Institute of Visual Sciences, 2232 Webster St., San Francisco, Calif. 94115

Threshold stimulation of the muscle nerve to the inferior oblique muscle of the cat activated a muscle fiber population with a twitch contraction time of 11 msec, and an electrical conduction velocity of 1.75 m. per second on an average. These values are very similar to those of the multiply innervated, slow-twitch fibers and motor units described previously in cat eye muscle. In natural eye movements this fiber component would be recruited late when large eye excursions are needed.

Key Words: extraocular muscle • cat • threshold nerve stimulation • units • electrical and mechanical properties • recruitment of motor units in eye movements

Submitted on May 7, 1974






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