Dorlands
/Elsevier m_22/12550484 | ||
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Origin annulus of Zinn at the orbital apex Insertion 6.5 mm inferior to the limbus Nerve inferior branch of oculomotor nerve Actions depression and adduction Latin musculus rectus inferior bulbi | ||
Innervation
As with most of the muscles of the orbit, it is innervated by the oculomotor nerve (Cranial Nerve III).
Function
It depresses, adducts, and helps extort (rotate laterally) the eye.
The inferior rectus muscle is the only muscle that is capable of depressing the pupil when it is in a fully abducted position.
References
Inferior rectus muscle Wikipedia(Text) CC BY-SA