Superior Rectus Muscle (Section Skull), Lateral View

Description

Coursing along the superior aspect of the globe, the superior rectus muscle is shown in lateral profile as a fleshy belly that narrows into a tendon inserting on the anterior superior sclera, just posterior to the corneoscleral limbus. From this angle, its trajectory runs superior to the optic nerve sheath as the optic nerve exits the posterior pole and passes through the orbital apex. The muscle sits deep to the orbital roof (frontal bone) and relates medially to the ethmoid wall, while the zygomatic contribution to the lateral orbital rim frames the anterior margin of the section. Extraocular muscle neighbors are suggested around the globe, but the superior rectus dominates the field. Lateral sectioning of the orbit makes the superior rectus–optic nerve relationship easy to teach and clinically concrete. In superior rectus palsy (oculomotor nerve, CN III), the eye drifts down and out with impaired elevation and diplopia on upgaze, and this view supports correlation of the muscle’s line of pull with that examination finding. Surgical planning also benefits: during strabismus recession or resection, the superior rectus is accessed through a superior conjunctival incision, and awareness of its proximity to the superior ophthalmic vein, levator palpebrae superioris complex, and the optic nerve posteriorly helps frame safe dissection and placement of sutures. Orientation matters. Use this illustration in head and neck anatomy labs, neuro-ophthalmology teaching on ocular motility and cranial nerve III lesions, or in ophthalmic surgery texts covering extraocular muscle exposure and tendon insertion landmarks on the sclera. It also fits radiology and sectional anatomy modules that map orbital walls and the orbital apex to clinical symptoms. Anatomical accuracy verified by SciePro's Medical Advisory Board.