extraoculaire

Extraoculaire is an adjective used in anatomy and medicine to describe structures located outside the eyeball (the globe). In ophthalmology, the term most often refers to the extraocular muscles, a group of six muscles that move the eye: the four rectus muscles—superior, inferior, medial, and lateral—and the two oblique muscles—superior and inferior. These muscles originate from the orbital apex, with the recti attaching at the annulus of Zinn and the obliques arising from the floor of the orbit, and insert on the sclera. They are mainly innervated by cranial nerves III (oculomotor), IV (trochlear), and VI (abducens). The coordinated activity of these muscles produces the six cardinal movements of gaze and, for the obliques, torsional movements.

The term extraocular can also denote other tissues and structures outside the globe, such as the eyelids, lacrimal apparatus, conjunctiva, orbital fat, and neurovascular elements that lie within the orbital cavity but outside the eyeball itself. Clinically, pathology of extraocular structures includes strabismus, ophthalmoplegia, diplopia, and restricted eye movement, and evaluation often centers on extraocular movements and alignment. In developmental and comparative anatomy, extraocular muscles illustrate how the eyeball is controlled independently of orbital contents.

Etymology: from Latin extra- meaning outside and oculus meaning eye.