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Sulcus (morphology)

Gingival sulcus at neck of mammalian tooth
Pollen grains of Cercis are sulcate, with reticulate surface.
Rotating image of human brain, illustrating the lateral sulcus in the brain.

In biological morphology and anatomy, a sulcus (pl. sulci) is a furrow or fissure (Latin fissura, plural fissurae). It may be a groove, natural division, deep furrow, elongated cleft, or tear in the surface of a limb or an organ, most notably on the surface of the brain, but also in the lungs, certain muscles (including the heart), as well as in bones, and elsewhere. Many sulci are the product of a surface fold or junction, such as in the gums, where they fold around the neck of the tooth.

In invertebrate zoology, a sulcus is a fold, groove, or boundary, especially at the edges of sclerites or between segments.

In pollen a grain that is grooved by a sulcus is termed sulcate.

Examples in anatomy

Liver

Lung

Skull

Other types

In neuroanatomy

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 sulcus or Calcerine fissure: extends from the occipital of the cerebrum to the occipital fissure.
  • Callosomarginal fissure: found in the medial surface of the cerebrum.
  • Central sulcus or Rolando'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.
  • Fissure of Bichat: found below the corpus callosum in the cerebellum of the brain.
  • Lateral sulcus or Fissure of Sylvius: separates the frontal and parietal lobes of the brain from the temporal lobe.
  • Hippocampal sulcus: a sulcus 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. Note that a "transverse fissure" can also be found in the liver and lungs.
  • Longitudinal fissure or Medial longitudinal fissure: which divides the cerebrum into the two hemispheres.
  • Occipitoparietal fissure: found between the occipital and parietal lobes of the brain.
  • Wernicke's fissure: separates the brain's temporal and parietal lobes from the occipital lobe.
  • Zygal fissure: found in the cerebrum.

In the brain a sulcus is a groove formed in the stage of gyrification by the folding of the cortex. There are many sulci and gyri formed. A larger than usual sulcus may instead be called a fissure such as the longitudinal fissure that separates the two hemispheres.

See also


This page was last updated at 2022-11-12 14:31 UTC. Update now. View original page.

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