fissure

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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 ?
2%), in the remaining 43 the groove passed from lateral end of superior orbital fissure to posterior end of inferior orbital fissure.
found the distance between the IOF and midpoint of the inferior orbital fissure to be 24 mm whereas Hwang & Baik found it to be 26mm.
6) The inferior ophthalmic vein passes through the inferior orbital fissure under the optic nerve and communicates with the pterygoid plexus; there it either joins the superior ophthalmic vein or empties into the cavernous sinus.

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