sylvian fissure

fissure /fis·sure/ (fish´er)

1. any cleft or groove, normal or otherwise, especially a deep fold in the cerebral cortex involving its entire thickness.

2. a fault in the enamel surface of a tooth.

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abdominal fissure  a congenital cleft in the abdominal wall.

anal fissure , fissure in ano painful lineal ulcer at the margin of the anus.

anterior median fissure  a longitudinal furrow along the midline of the anterior aspect of the spinal cord and medulla oblongata.

basisylvian fissure  the part of the sylvian fissure between the temporal lobe and the orbital surface of the frontal bone.

fissure of Bichat  transverse f. (2).

branchial fissure 

1. branchial cleft (1).

2. pharyngeal groove.

calcarine fissure  see under sulcus.

central fissure  see under sulcus.

collateral fissure  see under sulcus.

enamel fissure  fissure (2).

hippocampal fissure  see under sulcus.

palpebral fissure  the longitudinal opening between the eyelids.

parietooccipital fissure  see under sulcus.

portal fissure  porta hepatis.

posterior median fissure  see under sulcus.

presylvian fissure  the anterior branch of the fissure of Sylvius.

primary fissure of cerebellum  that separating the cranial and caudal lobes in the cerebellum.

fissure of Rolando  central sulcus of cerebrum.

sphenooccipital fissure  the fissure between the basilar part of the occipital bone and the sphenoid bone.

sylvian fissure , fissure of Sylvius one extending laterally between the temporal and frontal lobes, and turning posteriorly between the temporal and parietal lobes.

transverse fissure 

1. porta hepatis.

2. the transverse cerebral fissure between the diencephalon and the cerebral hemispheres.

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sylvian fissure

n.

Variant of fissure of Sylvius.

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sylvian fissure

Etymology: Franciscus Sylvius; L, fissura, cleft

the lateral sulcus of the cerebral hemisphere. Also called sylvian sulcus.

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fissure [fish´er]

1. a narrow slit or cleft, especially one of the deeper or more constant furrows separating the gyri of the brain.

2. a deep cleft in the surface of a tooth, usually due to imperfect fusion of the enamel of the adjoining dental lobes. It can be treated with a dental sealant to decrease risk of caries.

abdominal fissure a congenital cleft in the abdominal wall; see also gastroschisis and thoracoceloschisis. Called also celoschisis.

anal fissure (fissure in ano) a painful lineal ulcer at the margin of the anus.

anterior median fissure a longitudinal furrow along the midline of the ventral surface of the spinal cord and medulla oblongata.

fissure of Bichat transverse fissure (def. 2).

branchial fissure pharyngeal groove.

central fissure fissure of Rolando.

collateral fissure a longitudinal fissure on the inferior surface of the cerebral hemisphere between the fusiform gyrus and the hippocampal gyrus.

Henle's f's spaces filled with connective tissue between the muscular fibers of the heart.

hippocampal fissure one extending from the splenium of the corpus callosum almost to the tip of the temporal lobe; called also hippocampal sulcus.

longitudinal fissure the deep fissure between the two cerebral hemispheres.

palpebral fissure the longitudinal opening between the eyelids.

portal fissure porta hepatis.

posterior median fissure

1. a shallow vertical groove in the closed part of the medulla oblongata, continuous with the posterior median fissure of the spinal cord.

2. a shallow vertical groove dividing the spinal cord throughout its length in the midline posteriorly; called also posterior median sulcus.

presylvian fissure the anterior branch of the fissure of Sylvius.

pudendal fissure rima pudendi.

Rolando's fissure (fissure of Rolando) a groove running obliquely across the superolateral surface of a cerebral hemisphere, separating the frontal lobe from the parietal lobe. Called also central fissure and central sulcus.

fissure of round ligament one on the visceral surface of the liver, lodging the round ligament in the adult.

sylvian fissure (fissure of Sylvius) one extending laterally between the temporal and frontal lobes, and turning posteriorly between the temporal and parietal lobes.

transverse fissure

1. porta hepatis.

2. the transverse cerebral fissure between the diencephalon and the cerebral hemispheres; called also fissure of Bichat.

zygal fissure any of the fissures on the cerebral cortex that consist of two branches connected by a stem.

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sylvian fissure

a fissure extending laterally between the temporal and frontal lobes, and turning posteriorly between the temporal and parietal lobes. Called also fissure of Sylvius, lateral cerebral sulcus.