precentral gyrus

Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Related to precentral gyrus: postcentral gyrus


 [ji´rus] (pl. gy´ri) (L.)
one of the many convolutions of the surface of the cerebral hemispheres caused by infolding of the cortex, separated by fissures or sulci; called also cerebral gyrus.
angular gyrus one continuous anteriorly with the supramarginal gyrus.
annectent gyri various small folds on the cerebral surface that are too inconstant to bear specific names; called also gyri transitivi.
Broca's gyrus inferior frontal gyrus.
central gyrus, anterior precentral gyrus.
central gyrus, posterior postcentral gyrus.
cerebral gyrus gyrus.
Cerebral gyri. From Applegate, 1996.
cingulate gyrus (gyrus cin´guli) an arch-shaped convolution situated just above the corpus callosum.
frontal gyrus any of the three (inferior, middle, and superior) gyri 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 gyrus) and a medial (medial occipitotemporal gyrus) part.
hippocampal gyrus (gyrus hippocam´pi) one on the inferior surface of each cerebral hemisphere, lying between the hippocampal and collateral fissures; called also parahippocampal gyrus.
infracalcarine gyrus (lingual gyrus) one on the occipital lobe that forms the inferior lip of the calcerine sulcus and, together with the cuneus, the visual cortex.
marginal gyrus the middle frontal gyrus.
occipital gyrus any of the three (superior, middle, 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 hippocampal gyrus.
paraterminal gyrus a thin sheet of gray matter in front of and ventral to the genu of the corpus callosum.
postcentral gyrus the convolution of the frontal lobe immediately behind the central sulcus; the primary sensory area of the cerebral cortex; called also posterior central gyrus.
precentral gyrus the convolution of the frontal lobe immediately in front of the central sulcus; the primary motor area of the cerebral cortex; called also anterior central gyrus.
gyrus rec´tus a cerebral convolution on the orbital aspect of the frontal lobe.
supramarginal gyrus that part of the inferior parietal convolution which curves around the upper end of the fissure of Sylvius.
temporal gyrus any of the gyri of the temporal lobe, including inferior, middle, superior, and transverse temporal gyri; the more prominent of the latter (anterior transverse temporal gyrus) represents the cortical center for hearing.
gy´ri transiti´vi annectent gyri.
uncinate gyrus the uncus.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

pre·cen·tral gy·rus

bounded posteriorly by the central sulcus and anteriorly by the precentral sulcus.
Farlex Partner Medical Dictionary © Farlex 2012

pre·cen·tral gy·rus

(prē-sen'trăl jī'rŭs) [TA]
Bounded posteriorly by the central sulcus and anteriorly by the precentral sulcus.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
In contrast, false belief, strategic games, and trait judgments did not show any overlap in the IFG or the precentral gyrus, which is consistent with the fact that those tasks do not present biological cues but more abstract stimuli.
Number of subjects with damage to precentral gyrus in relation to motor grade.
The face is represented in the first one third of the lateral precentral gyrus, the upper extremity (arm, forearm and hand especially), is represented in the second third of the lateral precentral gyrus, and the trunk is represented in the third third (medial) of the precentral gyrus; the hip is represented in the place where precentral gyrus is continuing with paracentral gyrus and the lower limb (thigh, leg and foot), is represented in anterior paracentral gyrus (fig.
Abstinent users only demonstrated greater response than recent users in the right precentral gyrus, yet the mechanism behind this group difference is unclear.
In healthy adults, action verb naming has been shown to be supported by left frontal cortical areas, including the left prefrontal cortex (Shapiro et al., 2001), the left superior parietal lobule, the left superior temporal gyrus (Shapiro et al., 2006), the left superior frontal gyrus (Shapiro et al., 2005), and the primary motor cortex in the posterior portion of the precentral gyrus (Porro et al., 1996, [13], and Pulvermuller et al., 2005).
Left PUT was strongly associated with the right precentral gyrus (PRE), POST, and SMG, left inferior temporal gyrus (ITG), AG, GP, and THA, and bilateral frontal, occipital, and limbic lobes, PCUN, INS, and CAU.
In monoparetic stroke, lesion pattern and location were described as follows: (1) the presence or absence of cortical involvement, (2) multiple lesions (more than two topographically distinct lesions) or single lesion (uninterrupted lesion visible in contiguous territories) [12], and (3) lesion location: (i) the precentral knob area only, (ii) precentral gyrus with additional regions, (iii) parietal lobe only, (iv) medial frontal lobe (supplied from anterior cerebral artery), and (v) subcortical regions.
Eight significant clusters were found with increased brain activation from pre- to post-training, compared with non-CRT patients [Table 2] and [Figure 2], (1) the left inferior frontal gyrus (1120 mm [sup]3, BA9); (2) the left medial frontal gyrus (512 mm [sup]3, BA32); (3) the right middle frontal gyrus (464 mm [sup]3, BA6); (4) the left precentral gyrus (416 mm [sup]3, BA6); (5) the right postcentral gyrus (416 mm [sup]3, BA2); (6) the left medial frontal gyrus (352 mm [sup]3, BA6); (7) the right sub-gyral (296 mm [sup]3, BA6); and (8) the left sub-gyral (216 mm [sup]3, BA6).
They found that the 'small world' property of the brain network of patients with schizophrenia was abnormal: (a) compared to normal brains the characteristic path length and the clustering coefficient increased; (b) the nodes in some brain areas had decreased centrality and thinner cortices (especially the left parahippocampal gyrus, inferior temporal gyrus, angular gyrus, and right superior frontal gyrus, which are part of the default network); and (c) the nodes in other brain areas had increased centrality, including nodes in the primary cortex (bilateral precuneous, left precentral gyrus, postcentral gyrus, and right Heschl gyrus) and the paralymbic system (bilateral orbital frontal gyrus, temporal pole, right cingulate tract, and inferior parietal gyrus).
Brain regions MNI coordinates BA (x, y, z) Middle frontal -36 47 22 10 gyrus ACC -3 2 46 32/24 Superior temporal 54 8 -2 22/38 gyrus Inferior parietal -57 -34 25 40 lobule Precentral gyrus 48 0 9 44 Postcentral gyrus -48 -16 22 3 Thalamus 3 -9 6 -- Putamen -21 13 4 -- Cerebellum 30 -70 -23 -- Brain regions L/R Voxels T values Middle frontal L 25 4.889 gyrus ACC L 22 4.9336 Superior temporal R 115 6.738 gyrus Inferior parietal R 50 4.928 lobule Precentral gyrus R 20 8.8206 Postcentral gyrus L 25 5.022 Thalamus R 16 6.115 Putamen L 20 5.8152 Cerebellum R 47 6.2835 Table 2: Activations for SD group during acupuncturing on SP6 compared with a resting baseline are shown (P < 0.001, cluster >10 voxels, uncorrected).