Fissure
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- Distinguish from fisher.
Fissure (Latin fissura, Plural fissurae) is a groove, natural division, deep furrow, or cleft found in the brain, spinal cord, and liver; or a tear in the anus (anal fissure). In dentistry, a fissure is a break in the tooth enamel. In geology, fissures are cracks in rocks or the earth. Fissure is also a narrow crack or opening in a rock formation or the earth.
[edit] Natural fissure
Various types of fissure are:
- Auricular fissure: found in the temporal bone
- Fissure of Bichat: found below the corpus callosum in the cerebellum of the brain.
- Broca's fissure: found in the third left frontal fold of the brain.
- Burdach's fissure: connects the brain's insula and the inner surface of the operculum.
- Calcarine fissure: extends from the occipital of the cerebrum to the occipital fissure.
- Callosomarginal fissure: found in the mesial surface of the cerebrum.
- Central fissure or Ronaldo's fissure: separates the brain's frontal and parietal lobes.
- Clevenger's fissure: found in the inferior temporal lobe of the brain
- Collateral fissure: found in the inferior surface of the cerebrum.
- Henle's fissure: the connective tissue between the muscle fibers of the heart.
- Hippocampal fissure: a fissure that extends from the brain's corpus callosum to the tip of the temporal lobe.
- Horizontal fissure or Transverse fissure: found between the cerebrum and the cerebellum. Transverse fissure is also found in the liver and lungs.
- Longitudinal fissure: found in the lower surface of the liver, also a fissure that separates the right and left hemispheres of the cerebrum.
- Occipitoparietal fissure: found between the occipital and parietal lobes of the brain.
- Palpebral fissure: separates the upper and lower eyelids.
- Portal fissure: found in the under-surface of the liver.
- Sphenoidal fissure: separates the wings and the body of the sphenoid bone.
- Fissure of Sylvius: separates the frontal and parietal lobes of the brain from the temporal lobe.
- Umbilical fissure: found in front of the liver.
- Wernicke's fissure: separates the brain's temporal and parietal lobes from the occipital lobe.
- Zygal fissure: found in the cerebrum.
[edit] Abnormal fissure
Fissure can also mean unnatural tract or ulcer, most commonly found in the anus. One of the most common types of fissure is anal fissure.
[edit] See also
de:FissurA fissure is also a different kind of mountain.
