Inferior rectus muscle

The inferior rectus muscle is a muscle in the orbit.

Inferior rectus
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
Originannulus of Zinn at the orbital apex
Insertion6.5 mm inferior to the limbus
Nerveinferior branch of oculomotor nerve
Actionsdepression and adduction
Identifiers
Latinmusculus rectus inferior bulbi
TAA15.2.07.011
FMA49036
Anatomical terms of muscle

Structure
See also: Extraocular muscles

Innervation

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

Function
See also: Eye movement

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
  • Dissection showing origins of right ocular muscles, and nerves entering by the superior orbital fissure.
  • The right eye in sagittal section, showing the fascia bulbi (semidiagrammatic).
  • Inferior rectus muscle
  • Inferior rectus muscle
  • Extrinsic eye muscle. Nerves of orbita. Deep dissection.
  • Extrinsic eye muscle. Nerves of orbita. Deep dissection.
  • Extrinsic eye muscle. Nerves of orbita. Deep dissection.
  • Extrinsic eye muscle. Nerves of orbita. Deep dissection.

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