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.
Details
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
Identifiers
Latin musculus rectus inferior bulbi
TA A15.2.07.011
FMA 49036
Anatomical terms of muscle
[edit on Wikidata]

The inferior rectus muscle is a muscle in the orbit.

Structure

Innervation

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

Function

It depresses, adducts, and helps extort 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

References

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

External links

  • Anatomy figure: 29:01-07 at Human Anatomy Online, SUNY Downstate Medical Center
  • lesson3 at The Anatomy Lesson by Wesley Norman (Georgetown University) (orbit5)
  • Diagram at mun.ca
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