Corpus: Inferior rectus muscle
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1. Definition
The rectus inferior muscle is a skeletal muscle of the outer eye musculature.
2. Course
The rectus inferior muscle has its origin at the annulus tendineus communis. After a straight course, the muscle attaches via the sclera to the lower surface of the bulbus oculi, ventral to the equator bulbi.
3. Innervation
The inferior rectus muscle is innervated by the inferior ramus of the oculomotor nerve.
4. Blood supply
The muscular rami of the ophthalmic artery and the orbital rami of the infraorbital artery are responsible for the arterial blood supply.
5. Function
The rectus inferior muscle causes the eye to descend, i.e. the eyeball is turned downwards (caudally) during contraction. It is supported by the obliquus superior muscle. In addition, the rectus inferior muscle adducts the eye (adduction) and rotates the upper half of the eyeball outwards