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] .
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Malignant tumor has not been suggested because the imaging studies showed only the limited swelling of the inferior rectus muscle without any intraorbital space occupying lesion.
He underwent revision endoscopic sinus surgery to revise the maxillary antrostomy, along with a transconjunctival orbitotomy to release the inferior rectus muscle and repair the orbital floor defect.
Thus, in patients with MFT presenting with diplopia, MRI could serve as the imaging modality of choice to visualize herniation or entrapment of the inferior rectus muscle or periorbital tissues.
(c) The vertical diameters of the superior and inferior rectus muscles. (d) The thickness of fatty tissue.
(26) It is believed that the increased orbital congestion and tightening of the inferior rectus muscle blocks episcleral aqueous outflow.
Extensive scarring was encountered, and the inferior rectus muscle was trapped within the orbital floor defect.
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).
For the lower eyelid, the muscle/tendon complex inserts via a capsulopalpebral ligament, which connects the lower lid to the inferior rectus muscle; hence on down-gaze, the eyelid moves down too.
Superiorly, the lesion extended through the orbital floor in the retroocular region, displacing the inferior rectus muscle superiorly (figure 1, B).

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