sulcus /sul·cus/ (sul´kus) pl. sul´ci [L.] a groove, trench, or furrow; in anatomy, a general term for such a depression, especially one on the brain surface, separating the gyri.
sulcus
sulcus [sul´kus] (L.)
arterial sulci grooves on the internal surfaces of the cranial bones for the meningeal arteries.
calcarine sulcus a sulcus of the medial surface of the occipital lobe, separating the cuneus from the lingual gyrus.
central cerebral sulcus one between the frontal and parietal lobes of the cerebral hemisphere.
cerebral sulci the furrows between the cerebral gyri.
cerebral sulcus, lateral fissure of Sylvius.
cingulate sulcus one on the median surface of the hemisphere midway between the corpus callosum and the margin of the surface.
collateral sulcus one on the inferior surface of the cerebral hemisphere between the fusiform and parahippocampal gyri.
sul´ci cu´tis the fine depressions on the surface of the skin between the dermal ridges.
gingival sulcus the groove between the surface of the tooth and the epithelium lining the free gingiva.
hippocampal sulcus one extending from the splenium of the corpus callosum almost to the tip of the temporal lobe.
interlobar sulci the sulci that separate the lobes of the brain from each other.
intraparietal sulcus one separating the parietal gyri.
sulcus of matrix of nail the skin fold in which the proximal part of the nail is embedded.
parietooccipital sulcus one marking the boundary between the cuneus and precuneus, and also between the parietal and occipital lobes of the cerebral hemisphere.
posterior median sulcus
1. a shallow vertical groove in the closed part of the medulla oblongata, continuous with the posterior median sulcus of the spinal cord.
2. a shallow vertical groove dividing the spinal cord throughout its whole length in the midline posteriorly.
precentral sulcus one separating the precentral gyrus from the remainder of the frontal lobe.
scleral sulcus a slight groove at the junction of the sclera and cornea.
venous sulci grooves on the internal surfaces of the cranial bones for the meningeal veins.
sul·cus (s l k s)n. pl. sul·ci (-k  , -s) 1. Any of the grooves on the brain surface, bounding the gyri; a fissure. 2. A long narrow groove or depression, as in an organ or a tissue. sul cal adj. |
sulcus
[sul′kəs] pl. sulci
Etymology: L, furrow
a shallow depression, or furrow on the surface of an organ, such as cerebral sulcus that separates the convolutions of the cerebral hemisphere. A sulcus is usually not as deep as a fissure, but, in the terminology of anatomy, the words sulcus and fissure are often used interchangeably. sulcate, adj.
sulcus [sul´kus] (L.)
a groove or furrow; used in anatomic nomenclature to designate a linear depression, especially one of the cerebral sulci.
basilar sulcus a groove in the midline of the anterior surface of the pons, lodging the basilar artery.
calcarine sulcus a sulcus of the medial surface of the occipital lobe, separating the cuneus from the lingual gyrus.
central sulcus fissure of Rolando.
cerebral sulci the furrows on the surface of the brain between the gyri (see gyrus).
Cerebral sulci, showing some major ones on the superolateral surface of the left cerebral hemisphere. From Dorland's, 2000.
collateral sulcus collateral fissure.
sul´ci cu´tis fine depressions of the skin between the ridges of the skin.
gingival sulcus the space between the surface of the tooth and the epithelium lining the free gingiva.
hippocampal sulcus hippocampal fissure.
posterior median sulcus posterior median fissure.
sulcus (sulˑ·k
s),n any of the narrow grooves in an organ or tissue, such as those that separate the convolutions of the cerebral hemisphere; used interchangeably with
fissure, although a sulcus is not as deep as a fissure.
fissure, although a sulcus is not as deep as a fissure.
sulcus (sul´k
s),n 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.
2. a groove or depression on the surface of a tooth.
3. a groove in a portion of the oral cavity.
sulcus, alveololingual,
n the space between the alveolar or residual alveolar ridge and the tongue. It extends from the lingual frenum to the retromylohyoid curtain and is a part of the floor of the oral cavity.
sulcus, gingival,
n the shallow groove between the free gingiva and the surface of a tooth and extending around its circumference. Older term:
gingival crevice. See also pocket.
gingival crevice. See also pocket.
sulcus, implant gingival,
n a sulcus around the implant abutment post that resembles the sulcus around a healthy natural tooth.
n the groove that runs between the corner of the upper lip and the nose. Also known as
sulcus nasolabialis.
sulcus nasolabialis.
sulcus, occlusal,
n a groove or spillway on the occlusal surface of a tooth.
sulcus, terminalis,
n a V-shaped shallow groove on the surface of the tongue that separates the distal third of the tongue from the proximal two-thirds.
sulcus
pl. sulci [L.] a groove or furrow; a linear depression, especially one separating the gyri of the brain.
abomasal sulcus
the third or abomasal part of the gastric groove.
alar sulcus
lies between the dorsolateral cartilage at the nostril and the lateral accessory cartilage.
calcarine sulcus
see calcarine sulcus.
central sulcus
fissure of Rolando.
collateral sulcus
see collateral fissure.
coronal sulcus
a groove at the top of the hoof wall that houses the coronal matrix.
coronary sulcus
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 sulcus
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.
sulcus cutis
fine depressions of the skin between the ridges of the skin.
dorsal median sulcus
see dorsal median fissure.
gingival sulcus
the groove between the surface of the tooth and the epithelium lining the free gingiva.
hippocampal sulcus
hippocampal fissure.
jugular sulcus
see jugular furrow.
lateral cerebral sulcus
see sylvian fissure.
sulcus limitans
a longitudinal groove in the neural tube wall of the embryo; stretches from the mesencephalon caudad.
omasal sulcus
the second part of the gastric groove in ruminants.
reticular sulcus
the first part of the gastric groove in ruminants.
rhinal sulcus
a deep groove which separates the neopallium from the paleopallium on the lateral surface of the brain.
rumenoreticular sulcus
a groove on the external surface of the forestomachs that marks the division between the rumen and reticulum.
scleral sulcus
the groove between the sclera and cornea.
sylvian sulcus
a landmark groove on the lateral side of the cerebral cortex.
urethral sulcus
the furrow in the ventral aspect of the corpus cavernosum of the penis that accommodates the corpus cavernosum urethrae and the urethra.
sulcus
A depression or a groove found on the surface of an organ or tissue, as on the surface of the brain separating adjacent convolutions. Large sulci that divide the brain into lobes as well as the two hemispheres are more often called fissures. Plural: sulci. See fissure.
calcarine sulcus See calcarine fissure.
ciliary sulcus A groove situated between the posterior root of the iris and the ciliary body. It may be used, sometimes, as a site of fixation of an intraocular lens implant. See intraocular lens.
inferior palpebral sulcus A furrow in the skin of the lower eyelid. It separates the tarsal from the orbital portion of the lid. It is often not very distinct although it becomes more so with age.
internal scleral sulcus A slight, circular groove situated at the margin between the posterior surface of the cornea and the sclera. It contains the trabecular meshwork and the canal of Schlemm. The posterior lip of the sulcus forms a projecting ridge called the scleral spur. See scleral spur.
optic sulcus See optic pit.
subtarsal sulcus A groove on the inner surface of the eyelid, near the eyelid margin and parallel to it, which forms the border separating the marginal from the tarsal conjunctiva. Foreign bodies are commonly lodged in this groove. See lid eversion; irrigation.
superior palpebral sulcus A furrow in the skin of the upper eyelid. It separates the tarsal portion, which is closest to the lid margin from the orbital portion, which extends from the tarsus to the eyebrow. This furrow becomes more prominent with age. See palpebral aperture.
calcarine sulcus See calcarine fissure.
ciliary sulcus A groove situated between the posterior root of the iris and the ciliary body. It may be used, sometimes, as a site of fixation of an intraocular lens implant. See intraocular lens.
inferior palpebral sulcus A furrow in the skin of the lower eyelid. It separates the tarsal from the orbital portion of the lid. It is often not very distinct although it becomes more so with age.
internal scleral sulcus A slight, circular groove situated at the margin between the posterior surface of the cornea and the sclera. It contains the trabecular meshwork and the canal of Schlemm. The posterior lip of the sulcus forms a projecting ridge called the scleral spur. See scleral spur.
optic sulcus See optic pit.
subtarsal sulcus A groove on the inner surface of the eyelid, near the eyelid margin and parallel to it, which forms the border separating the marginal from the tarsal conjunctiva. Foreign bodies are commonly lodged in this groove. See lid eversion; irrigation.
superior palpebral sulcus A furrow in the skin of the upper eyelid. It separates the tarsal portion, which is closest to the lid margin from the orbital portion, which extends from the tarsus to the eyebrow. This furrow becomes more prominent with age. See palpebral aperture.
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