Sign Up for a Free Account

This is an image preview.
Start a Free Account
to view the full image.

  • Nearly 3,000 illustrations, including video clips of neurologic disorders.

  • Every article is reviewed by our esteemed Editorial Board for accuracy and currency.

  • Full spectrum of neurology in 1,200 comprehensive articles.

  • Listen to MedLink on the go with Audio versions of each article.

View of the right orbit from above

Cranial nerves III and IV are illustrated passing lateral to the internal carotid artery with V1 and V2. The abducens nerve and the wall of the cavernous sinus are not shown. The optic nerve enters the orbit through the optic canal, whereas the superior and inferior branches of III, IV (and VI) along with branches of V1 enter the orbit through the superior orbital fissure.

(Source: Gray H, Lewis WH. Gray’s Anatomy of the Human Body. 20th edition. Philadelphia: Lea & Febiger, 1918. Public domain.)