orbital fissure

noun

Medical Definition of orbital fissure

: either of two openings transmitting nerves and blood vessels to or from the orbit:

a : one situated superiorly between the greater wing and the lesser wing of the sphenoid bone

— called also superior orbital fissure, supraorbital fissure

b : one situated inferiorly between the greater wing of the sphenoid bone and the maxilla

— called also inferior orbital fissure, infraorbital fissure, sphenomaxillary fissure