Medial Rectus Muscle

Description

Running along the medial aspect of the adult male globe, the medial rectus muscle is shown as a straight extraocular band extending from the posterior orbit toward its anterior tendinous insertion on the sclera, just posterior to the corneoscleral limbus. Superior and inferior recti course over the superior and inferior hemispheres of the eyeball, while the oblique muscles angle across the globe to emphasize the layered relationships of the extraocular muscle cone. Posteriorly, the optic nerve exits the sclera at the optic disc and travels toward the orbital apex, lying deep to the recti as they converge toward the common tendinous ring. Small episcleral vessels are visible on the anterior globe. A tight field. Medial rectus anatomy matters most when you need to explain horizontal ductions and the mechanics of strabismus. Overaction or restriction of the medial rectus drives esotropia, and the muscle’s anterior scleral insertion is the landmark for recession and resection procedures, where a few millimeters of tendon repositioning can shift ocular alignment and relieve diplopia. Its position within the intraconal space also frames the surgical risk conversation in orbital decompression and optic nerve sheath work, where dissection planes run near rectus muscle bellies and their neurovascular supply. Use this artwork in gross anatomy and ophthalmology teaching to pair action vectors with attachments, or in a surgical atlas chapter illustrating strabismus correction and medial rectus tendon placement relative to the limbus, sclera, and optic nerve. It also fits patient-facing education on esotropia and postoperative alignment changes. Anatomical accuracy verified by SciePro's Medical Advisory Board.