medial rectus extraocular muscle

The medial rectus muscle is a muscle in the orbit. As with most of the muscles of the orbit, it is innervated by the inferior division of the oculomotor nerve (Cranial Nerve III). This muscle shares an origin with several other extrinsic eye muscles, the anulus tendineus, or common tendon. It is the largest of the extraocular muscles and its only action is adduction of the eyeball. [WP,unvetted]. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the medial rectus extraocular muscle is

The medial rectus muscle is a muscle in the orbit. As with most of the muscles of the orbit, it is innervated by the inferior division of the oculomotor nerve (Cranial Nerve III). This muscle shares an origin with several other extrinsic eye muscles, the anulus tendineus, or common tendon. It is the largest of the extraocular muscles and its only action is adduction of the eyeball. [WP,unvetted]. The atlas records it as a muscle at the organ scale in the human body.

Where the medial rectus extraocular muscle is

It sits in the head, within the muscular and sensory systems. Not positioned individually. Drawn inside the structure this dataset says contains it — the containment is asserted, the exact spot within it is not.

What the medial rectus extraocular muscle connects to

The atlas records 4 typed relationships for it, across 3 kinds of connection. part of cranial muscle.

Supply and innervation

Innervation: oculomotor nerve and inferior branch of oculomotor nerve.

Also called

Also recorded as m. rectus medialis, medial rectus, medial rectus extraocular muscle, medial rectus muscle, musculus rectus medialis and medial recti, and 1 more. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0001602, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: cranial muscle.
• A kind of: rectus extraocular muscle.
• Innervated by: oculomotor nerve and inferior branch of oculomotor nerve.

Questions

Where is the medial rectus extraocular muscle?

It sits in the head, within the muscular and sensory systems. Not positioned individually. Drawn inside the structure this dataset says contains it — the containment is asserted, the exact spot within it is not.

What does the medial rectus extraocular muscle connect to?

Part of: cranial muscle.

Is the medial rectus extraocular muscle the same in other species?

Leumas holds the same relationship vocabulary for every species it carries, so where another dataset records this structure you can put the two side by side on /compare.