Lateral Rectus Muscle in a Section of the Skull, Gross Anatomy

Description

Shown in lateral profile within the bony orbit, the lateral rectus muscle forms a broad, red muscle belly along the lateral wall and continues anteriorly as a long tendon inserting onto the lateral sclera, just posterior to the corneoscleral junction. Superior and slightly anterior to the muscle’s distal course, the lacrimal gland occupies the superolateral orbit, with the lateral rectus tendon passing deep to it as it approaches the globe. Posteriorly, the optic nerve exits the globe and courses toward the orbital apex, framed by sectioned orbital bones that define the lateral orbital rim and adjacent sinus or nasal cavity spaces. Clear spatial cues. That relationship matters in orbital surgery and trauma. Lateral orbitotomy and approaches to superolateral orbital lesions (including lacrimal gland tumors) rely on understanding how the lateral rectus and its tendon sit deep to the gland and close to the lateral orbital wall, and how retraction or disinsertion of the muscle can create postoperative diplopia from impaired abduction. The orbital apex orientation also helps contextualize optic neuropathy risks when edema, hemorrhage, or instrumentation crowds the posterior orbit. Use this illustration in gross anatomy and head and neck courses to teach extraocular muscle topography, tendon insertions, and the clinical logic of abduction deficits, as well as in ophthalmology and oculoplastics texts discussing lacrimal gland surgery, lateral orbitotomy, and post-traumatic strabismus workup. It also suits patient-facing education for explaining lateral rectus involvement in abducens nerve palsy and orbital fracture repair planning. Anatomical accuracy verified by SciePro's Medical Advisory Board.