J Korean Ophthalmol Soc.  1976 Jun;17(2):137-142.

Experimental Observation on the Superior Oblique Muscle Function in the Rabbits

• Park BI
• Han HJ

Abstract

In anesthetized rabbits, the superior oblique muscle was excited by stimulation of a vestibular canal nerve. Induced reflex ocular movements were observed by the naked eyes, and were recorded by means of nystagmographic and oculographic techniques. Superior oblique muscle contraction induced by stimulation of a vestibular canal nerve produced ocular incycloduction associated with elevation. The elevatory action of superior oblique muscle was also demonstrated by means of the nystagmographic recording. Contraction of the superior oblique muscle caused augmented incycloduction in adduction of the eyeball, whereas excitation of the muscle produced augmented elevation in abduction of the eyeball. When these eye movements produced by the superior oblique muscle are compared to those of Tokumasu et al. observed in monkey and cat, the direction of the rotatory action appears to be contradictory. Such phenomenon may be ascribed to the anatomical differences of the oblique muscles in these animals endowed with the binocular or monocular vision.

MeSH Terms

Animals
Cats
Eye Movements
Haplorhini
Muscle Contraction
Muscles
Rabbits*
Reflex
Telescopes
Vision, Monocular