inferior rectus muscle


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Related to inferior rectus muscle: medial rectus muscle, Ocular muscles

in·fe·ri·or rec·tus mus·cle

(in-fēr'ē-ŏr rek'tŭs mŭs'ĕl)
Origin, inferior part of the common tendinous ring; insertion, inferior part of sclera of the eye; action, primary, depression; secondary, adduction and extorsion; nerve supply, oculomotor (inferior branch).
Synonym(s): musculus rectus inferior [TA] .

inferior rectus muscle

Extraocular muscle. Origin: tendinous ring around optic nerve at rear of orbit. Insertion: lower edge of eyeball in front of its equator. Nerve: oculomotor (CN III). Action: turns eye down and medially.
See: extraocular for illus.
See also: muscle
References in periodicals archive ?
Computerised Tomography scan of the orbit showed diffuse thickening of the medial rectus muscle, minimal thickening of the inferior rectus muscle on the right side with mass effect on the globe, mild proptosis and periorbital soft tissue thickening indicated inflammatory changes suggesting orbital pseudo-tumour (Figure 1).
Superiorly, the lesion extended through the orbital floor in the retroocular region, displacing the inferior rectus muscle superiorly (figure 1, B).
The side effects of the botulinum toxin treatment are mainly due to spread of toxin to noninjected muscles, particularly to the levator muscle, causing ptosis and to the inferior rectus muscle causing vertical diplopia.

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