Lateral Rectus, Gross Anatomy

Description

Originating from the lateral part of the common tendinous ring at the orbital apex, the lateral rectus runs anteriorly along the lateral wall of the orbit, closely related medially to the optic nerve and laterally to the zygomatic bone and lateral orbital fat. Its muscle belly courses parallel to the sphenoid bone near the superior orbital fissure before tapering to a tendon that inserts on the sclera posterior to the corneoscleral limbus, lateral to the iris and pupil. Portions of the other extraocular recti are implied around the globe, and episcleral vessels are visible on the scleral surface. A compact posterior view of the globe brings the orbital apex anatomy into the same frame. Lateral rectus anatomy matters most when you are thinking about abduction deficits and sixth cranial nerve pathology. Ischemic abducens palsy, raised intracranial pressure with downward brainstem displacement, and cavernous sinus disease all present with impaired lateral gaze, and the long intracranial course of CN VI makes it a frequent culprit. This relationship also underpins strabismus surgery: recession or resection targets the lateral rectus tendon at its scleral insertion, and proximity to the vortex veins and adjacent rectus insertions dictates safe needle passes. Small distances matter. Use this asset for head and neck gross anatomy teaching, ophthalmology and neuro-ophthalmology lectures on extraocular motility, and medical publishing on abducens palsy, cavernous sinus syndromes, or lateral rectus recession techniques. Anatomical accuracy verified by SciePro's Medical Advisory Board.