occipital gyrus


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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.

occipital gyrus

The inferior or the superior occipital gyrus.
See also: gyrus
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
An overlap of false belief, rational action, and visual perspective taking tasks was found in the left mid occipital gyrus (EBA).
We found that ReHo in the right caudate and inferior temporal gyrus was higher in both schizophrenic patient groups than in the healthy controls whereas ReHo in the bilateral postcentral gyrus and thalamus and the right inferior occipital gyrus was lower in both schizophrenic patient groups (FDR corrected, P < 0.05).
reported that stimulation of Liv3 selectively activated the middle occipital gyrus (BA 19), superior medial prefrontal gyrus (BA 10) [22].
First, the dancers showed higher ALFF in the left middle temporal gyrus, bilateral precentral gyrus, bilateral inferior frontal gyrus, left postcentral gyrus, left inferior temporal gyrus, right middle occipital gyrus, right superior temporal gyrus, and left middle frontal gyrus compared to the control group.
Component 11 showed differences in the middle temporal gyrus, lingual gyrus, subgyral regions, cuneus, superior temporal gyrus, precuneus, superior parietal lobule, inferior parietal lobule, and middle occipital gyrus. Component 15 from the SBM analysis showed differences in the brains of schizophrenic and healthy volunteers in the middle frontal gyrus, precentral gyrus, subgyrus, postcentral gyrus, superior frontal gyrus, medial frontal gyrus, cingulate gyrus, and superior temporal gyrus.
[50] Studying geriatric patients who had recovered from depression, Yuan and colleagues [51] found that compared to noncarriers, those who were carriers of the epsilon4 ([epsilon]4) allele of the apolipoprotein E (ApoE) gene had reduced grey matter volume in the frontal gyrus and the inferior occipital gyrus. A study among elderly persons who had recovered from depression by Wu and colleagues [52] found decreased FC in the posterior cingulated cortex and temporal lobe when performing episodic memory tasks (compared to the resting-state FC) that was more pronounced among [epsilon]4 allele carriers--supporting hypotheses about the role of ApoE [epsilon]4 in brain functions related to episodic memories.
This bundle runs from the superior occipital gyrus with an oblique and caudal direction to the fusiform gyrus.
[4] Luo and colleagues [5] reported that patients with OCD had a greater volume of white matter in the right precentral gyrus, the right postcentral gyrus, the bilateral precuneus, and the left middle occipital gyrus than control subjects; they also had a smaller volume of white matter in the bilateral superior frontal gyrus, the left postcentral gyrus, the left parahippocampal gyrus/ corpus callosum, and the right inferior parietal lobule.
For the seed at the right anterior cerebellum (MNI coordinate: x = 34, y = -84, and z = -31), patients showed significantly increased FCs with the left posterior cerebellum, right middle occipital gyrus, left superior occipital gyrus, and bilateral postcentral gyrus, and decreased FCs with the left superior frontal gyrus, bilateral orbital inferior frontal gyrus, left middle temporal gyrus, and the left SMA.
For the letter order contrast, the deaf group showed significant activation in the right occipital gyrus (however, only at the cluster level, not at the peak level) and the hearing group showed significant activation in the frontal, parietal, and occipital regions.
Further associations (at an uncorrected threshold) between behavioral gain and changes in [iFC.sub.SEMO] were found in parts of the right supramarginal gyrus and left cerebellar lobule VI, as well as in the right middle occipital gyrus, and the hand area of the left postcentral gyrus (all [P.sub.unc.] < 0.001, k > 10 vx; Table 2).
When making lip pursing movements compared with the healthy control group, it showed decreased activation in the ipsilateral culmen, CMA (posterior cingulate cortex), transverse temporal gyrus, SI (primary somatosensory cortex), precuneus, and contralateral superior occipital gyrus with lip pursing movements (Table 3, Figure 3).