A fibrous attachment at the apex of the orbit (anatomy) from which the four rectus extraocular muscles arise. Its relations distinguish structures passing through the optic canal and different parts of the superior orbital fissure.
The periosteum lining the orbit (anatomy). In an orbital dissection, it separates the surrounding bones from the contents until opened.
The inferior orbital fissure is a gap in the posterior-inferior orbital wall connecting the orbit with neighboring deep facial spaces. It transmits nerves and vessels, including routes associated with the maxillary division of the trigeminal nerve. It is distinct from the superior fissure.
The superior orbital fissure is an opening at the posterior orbit transmitting several ocular motor nerves and other structures. Relations to the common tendinous ring determine which pathways pass through or outside the ring. The nearby optic canal is a separate route.
The optic canal is the bony passage carrying the optic nerve and ophthalmic artery into the orbit. Its location differs from the superior orbital fissure used by several ocular motor nerves. This separation helps relate a local lesion to different patterns of visual and motor impairment.
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