parahippocampal gyrus


Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

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.

par·a·hip·po·cam·pal gy·rus

[TA]
a long convolution on the medial surface of the temporal lobe, forming the lower part of the fornicate gyrus, extending from behind the splenium corporis callosi forward along the dentate gyrus of the hippocampus from which it is demarcated by the hippocampal fissure. The anterior extreme of the gyrus curves back on itself, forming the uncus, the major location of the olfactory cortex.
See also: entorhinal area.

par·a·hip·po·cam·pal gy·rus

(par'ă-hip'ō-kam'păl jī'rŭs) [TA]
A long convolution on the medial surface of the temporal lobe, forming the lower part of the fornicate gyrus, extending from behind the splenium corporis callosi forward along the dentate gyrus of the hippocampus from which it is demarcated by the hippocampal fissure. The anterior extreme of the gyrus curves back on itself, forming the uncus, the major location of the olfactory cortex.
References in periodicals archive ?
Caption: Figure 3: Regression of group asymmetry indices for MCI nonconverters and converters in five selected ROIs, including the banks of the superior temporal sulcus (cyan), caudal middle frontal gyrus (red), inferior parietal lobule (blue), pars triangularis (green), entorhinal cortex (yellow), and parahippocampal gyrus (pink).
However, to the best of our knowledge none of these studies investigated the integrity of whole components, including the hippocampus, amygdala, parahippocampal gyrus, cingulum, and fornix together with diffusion tensor imaging (DTI).
Many brain regions were activated, including somatosensory cortex (such as the superior parietal lobule and postcentral gyrus), limbic-paralimbic system (such as the calcarine gyrus, precuneus, cingulate cortex, and parahippocampal gyrus), visual-related cortex (such as the fusiform and occipital gyri), pain regions (such as basal ganglia), and the cerebellum.
Five partial ROI contrasts were performed using explicit masks over the areas related to spatial cognition and semantic executive control: parahippocampal gyrus, entering 900 voxels into the analysis, hippocampus, entering 93 voxels; posterior cingulate cortex (PCC), entering 141 voxels; lingual gyrus, entering 196 voxels, and left PFMG, entering 229 voxels.
In a separate group of healthy patients, imagining a tennis game activated a part of the brain called the pre-motor cortex and imagining walking the streets or through a house activated another structure called the parahippocampal gyrus. The five brain-injured patients who responded to the test had activity in one or both areas when asked questions, the researchers said.
Right smack in the right parahippocampal gyrus is where we find the seat of the exceptional parent's most relied upon tool.
Well, bet you didn't know that the part of the brain responsible for detecting sarcasm is the right parahippocampal gyrus, did you?
When asked to imagine walking through the rooms of her house, activation was seen in the parahippocampal gyrus, posterior parietal cortex, and the lateral premotor cortex.
"This time her parahippocampal gyrus, which generates spatial maps, became active, again just as in healthy volunteers."
The medial temporal structural assessment could be done either qualitatively, on the hippocampus, choroidal fissure, or temporal horn, or quantitatively on the hippocampus, entorhinal cortex, or parahippocampal gyrus. "Studies suggest good sensitivity and specificity for AD and normal patients, and good discrimination of those who will progress from MCI."
In contrast, the women's brains showed greater activity in the left parahippocampal gyrus, including the amygdala an area of the brain associated with stimuli sign alling threat.
A neocortical region adjacent to the hippocampus, the parahippocampal gyrus, connects the hippocampus to the sensory processing regions.