gyrus /gy·rus/ (ji´rus) pl. gy´ri [L.] cerebral g.
gyrus
angular gyrus one arching over the superior temporal sulcus, continuous with the middle temporal gyrus.
gy´ri bre´ves in´sulae the short, rostrally placed gyri on the surface of the insula.
Broca's gyrus see under convolution.
central gyrus, anterior precentral g.
central gyrus, posterior postcentral g.
cerebral gyrus any of the tortuous convolutions on the surface of the cerebral hemispheres, caused by infolding of the cortex and separated by fissures or sulci.
cingulate gyrus an arch-shaped convolution just above the corpus callosum.
gyrus descen´dens the raised area posterior to the superior and inferior occipital gyri and anterior to the lunate sulcus when that is present.
frontal gyrus any of four gyri (inferior, medial, middle, and superior) of the frontal lobe.
fusiform gyrus one on the inferior surface of the hemisphere between the inferior temporal and parahippocampal gyri, consisting of a lateral (lateral occipitotemporal g.) and a medial (medial occipitotemporal g.) part.
gyrus geni´culi a vestigial gyrus at the anterior end of the corpus callosum.
hippocampal gyrus parahippocampal g.
infracalcarine gyrus lingual g.
interlocking gyri small gyri in the opposing walls of the central sulcus that interlock with each other like gears.
lingual gyrus one on the occipital lobe, forming the inferior lip of the calcarine sulcus and, with the cuneus, the visual cortex.
gyrus lon´gus in´sulae the long, occipitally directed gyrus on the surface of the insula.
occipital gyrus either of the two (superior and inferior) gyri of the occipital lobe.
occipitotemporal gyrus, lateral the lateral portion of the fusiform gyrus.
occipitotemporal gyrus, medial the medial portion of the fusiform gyrus.
orbital gyri irregular gyri on the orbital surface of the frontal lobe.
parahippocampal gyrus a convolution on the inferior surface of each cerebral hemisphere, lying between the hippocampal and collateral sulci.
paraterminal gyrus a thin sheet of gray substance in front of and ventral to the genu of the corpus callosum.
postcentral gyrus the convolution of the frontal lobe between the postcentral and central sulci; the primary sensory area of the cerebral cortex.
precentral gyrus the convolution of the frontal lobe between the precentral and central sulci; the primary motor area of the cerebral cortex.
gyrus rec´tus one on the orbital surface of the frontal lobe.
supramarginal gyrus that part of the inferior parietal convolution that curves around the upper end of the sylvian fissure.
temporal gyrus any of the gyri of the temporal lobe, including the inferior, middle, superior, and transverse temporal gyri; the more prominent of the latter (anterior transverse temporal g.), when two exist, represents the cortical center for hearing.
gy´ri transiti´vi ce´rebri various small folds on the cerebral surface that are too inconstant to bear individual names.
gy·rus (j  r s)n. pl. gy·ri (-r  ) A rounded ridge, as on the surfaces of the cerebral hemispheres. |
gyrus
one of the winding convolutions of the cerebral hemisphere of the brain. They are caused by infolding of the cortex and are separated by the shallow grooves (sulci) or deeper grooves (fissures). See also cerebral cortex .
gyrus
pl. gyri [L.] one of the many convolutions of the surface of the brain caused by infolding of the cortex (gyri cerebri), separated by fissures or sulci. These are not defined here. The list usually includes: g. ambiens, gyri breves insulae, g. callosus, g. centrifugales, g. centripetales, gyri cerebri, g. fasciolaris, g. lunaris and the cingulate, coronal, dentate, ectomarginal, ectosylvian, genual, marginal, occipital, parahippocampal, postcruciate, postsplenial, precruciate, prorean, splenial, suprasplenial and sylvian gyri.
cerebral gyri, gyri cerebri
the tortuous elevations (convolutions) on the surface of the cerebral hemisphere, caused by infolding of the cortex and separated by fissures or sulci.
gyrus
One of the prominent rounded elevations between the sulci or grooves on the surface of the hemispheres of the brain. There are numerous gyri. Those associated with the visual association areas are the angular and lingual gyri. Plural: gyri.
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