NCIt definition : One of the extraoculomotor muscles arising from a common tendinous ring in the posterior
part of the orbit with insertion on the medial surface of the sclera, which is innervated
by the inferior division of CN III, and functions to adduct the eye.;
Alternative definition : CDISC: A muscle of the eye, in general extending from the annulus of Zinn to the medial
aspect of the anterior portion of the eye at the annulus tendineus; primary function
is adduction of the eye.;