Inferior rectus muscle

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Inferior rectus
Eye movements depressors.jpg
The inferior rectus muscle, is shown in this superior view of the eye, along with its axis of rotation. The other muscle is the superior oblique muscle, which angles around the trochlea.
Latin musculus rectus inferior bulbi
Gray's p.1022
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
Anatomical terms of muscle

The inferior rectus muscle is a muscle in the orbit.

Structure[edit]

Innervation[edit]

As with most of the muscles of the orbit, it is innervated by the oculomotor nerve (Cranial Nerve III).

Function[edit]

See also: Eye movement

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.[1]

Additional images[edit]

References[edit]

  1. ^ "Eye Theory". Cim.ucdavis.edu. Retrieved 2010-11-27. 

External links[edit]