fissure

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Related to orbital fissure: orbital fossa, orbital gyri, orbital foramen

fissure

1. Anatomy a narrow split or groove that divides an organ such as the brain, lung, or liver into lobes
2. a small unnatural crack in the skin or mucous membrane, as between the toes or at the anus
3. a minute crack in the surface of a tooth, caused by imperfect joining of enamel during development

fissure

[′fish·ər]
(geology)
A high, narrow cave passageway.
An extensive crack in a rock.
(metallurgy)
A small cracklike discontinuity with a slight opening or displacement of the fracture surfaces.
References in periodicals archive ?
The cavernous sinus is a complex venous network, which includes parts of the superior and inferior ophthalmic veins, located immediately behind the superior orbital fissure.
9) Geraghty and Dolan reported that the complete diagnostic criteria for MSH are (1) enlargement of the vertical orbit, (2) enlargement of the superior orbital fissure, (3) elevation of the canine fossa, (4) enlargement of the pterygopalatine fissure, and (5) lateralization of the infraorbital neurovascular canal.
The maxillary division of the Vth cranial nerve exits the superior maxillary foramen and enters the orbit via the inferior orbital fissure.