sulcus

1. A deep, narrow furrow or groove, as in an organ or tissue.
2. Any of the narrow fissures separating adjacent convolutions of the brain.

[Latin.]

1. a furrow, trench, or groove, as on the surface of the brain or in the folds of mucous membranes. 2. a groove or depression on the surface of a tooth. 3. a groove in a portion of the oral cavity.

1. A groove in the tissue on the surface of the cerebral hemispheres in the brain.

2. An infolding of soft tissue in the mouth.

Pl. sulci [L.] a groove or furrow; a linear depression, especially one separating the gyri of the brain.

• abomasal s. — the third or abomasal part of the gastric groove.
• alar s. — lies between the dorsolateral cartilage at the nostril and the lateral accessory cartilage.
• calcarine s. — see calcarine sulcus.
• central s. — fissure of Rolando.
• collateral s. — see collateral fissure.
• coronal s. — a groove at the top of the hoof wall that houses the coronal matrix.
• coronary s. — an external groove which indicates the division of the ventricles of the heart and the atria. Houses the circumflex coronary blood vessels of the heart.
• cruciate s. — a deep groove which runs transversely across the rostro-dorsal surface of the cerebrum and which is one of the landmarks on the cerebral cortex.
• s. cutis — fine depressions of the skin between the ridges of the skin.
• dorsal median s. — see dorsal median fissure.
• gingival s. — the groove between the surface of the tooth and the epithelium lining the free gingiva.
• hippocampal s. — hippocampal fissure.
• jugular s. — see jugular furrow.
• lateral cerebral s. — see sylvian fissure.
• s. limitans — a longitudinal groove in the neural tube wall of the embryo; stretches from the mesencephalon caudad.
• omasal s. — the second part of the gastric groove in ruminants.
• reticular s. — the first part of the gastric groove in ruminants.
• rhinal s. — a deep groove which separates the neopallium from the paleopallium on the lateral surface of the brain.
• rumenoreticular s. — a groove on the external surface of the forestomachs that marks the division between the rumen and reticulum.
• scleral s. — the groove between the sclera and cornea.
• sylvian s. — a landmark groove on the lateral side of the cerebral cortex.
• urethral s. — the furrow in the ventral aspect of the corpus cavernosum of the penis that accommodates the corpus cavernosum urethrae and the urethra.

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Sulcus (plural sulci) may refer to:

• Sulcus (anatomy), grooves, crevices, and furrows in medicine, botany, and zoology
  • Sulcus (neuroanatomy), specifically in the brain
• Sulcus (geology), used in planetary geology to refer to subparallel grooves and ditches formed by geological processes

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