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The calcarine fissure (or calcarine sulcus) is an anatomical landmark located at the very caudal end of the medial surface of the brain. It begins near the occipital pole in two converging rami and runs forward to a point a little below the splenium of the corpus callosum, where it is joined at an acute angle by the medial part of the parietooccipital fissure. The anterior part of this fissure gives rise to the prominence of the calcar avis in the posterior cornu of the lateral ventricle. Image File history File links No higher resolution available. ...
Image File history File links No higher resolution available. ...
For other uses, see Latin (disambiguation). ...
The occipital lobe is the visual processing center of the mammalian brain, containing most of the anatomical region of the visual cortex. ...
In human anatomy, the posterior cerebral artery is the blood vessel that supplies oxygenated blood to the posterior aspect of the brain (occipital lobe). ...
NeuroNames is a system of nomenclature for the brain and related structures. ...
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A sulcus (pl. ...
The anterior end of the hemisphere is named the frontal pole. ...
The posterior end of the corpus callosum is the thickest part, and is termed the splenium. ...
The corpus callosum is a structure of the mammalian brain in the longitudal fissure that connects the left and right cerebral hemispheres. ...
Only a small part of the Parietooccipital Fissure (or parieto-occipital sulcus) is seen on the lateral surface of the hemisphere, its chief part being on the medial surface. ...
On the medial wall of the posterior cornu is a longitudinal eminence, the calcar avis (hippocampus minor), which is an involution of the ventricular wall produced by the calcarine fissure. ...
The ventricular system is a fluid conducting system within the brain. ...
The calcarine sulcus is where the primary visual cortex is concentrated. The central visual field is located in posterior portion of the calcarine sulcus and the peripheral visual field in the anterior portion. It is interesting to note, though unsurprising, that the amount of cortex dedicated to each square millimeter of the visual field is highly non-proportional; significantly more cortex is dedicated to the processing of information originating from the fovea than other locations.[1] This is known as cortical magnification. Brodmann area 17 (primary visual cortex) is shown in red in this image which also shows area 18 (orange) and 19 (yellow) The primary visual cortex (usually called V1) is the most well-studied visual area in the brain. ...
The fovea, a part of the eye, is a spot located in the center of the macula. ...
Cortical magnification describes how many neurons in an area of the visual cortex are responsible for processing a stimulus of a given size, as a function of visual field location. ...
References - ^ Wong A, Sharpe J (1999). "Representation of the visual field in the human occipital cortex: a magnetic resonance imaging and perimetric correlation". Arch. Ophthalmol. 117 (2): 208-17. PMID 10037566.
External links | Brain: telencephalon (cerebrum, cerebral cortex, cerebral hemispheres) | | Primary sulci/fissures | Medial longitudinal, Lateral, Central, Parietoöccipital, Calcarine, Cingulate, Callosal Collateral fissure | | Frontal lobe | Precentral gyrus (Primary motor cortex, 4), Precentral sulcus, Superior frontal gyrus/Frontal eye fields (6, 8, 9), Middle frontal gyrus (46), Inferior frontal gyrus (44-Pars opercularis, 45-Pars triangularis), Orbitofrontal cortex (10, 11, 12, 47) | | Parietal lobe | Somatosensory cortex (Primary (1, 2, 3, 43), Secondary (5)), Precuneus (7m), Parietal lobules (Arcuate fasciculus/Superior (7l), Inferior (40)), Angular gyrus (39), Intraparietal sulcus, Marginal sulcus | | Occipital lobe | Primary visual cortex (17), Cuneus, Lingual gyrus, 18, 19 - Lateral occipital sulcus | | Temporal lobe | Primary auditory cortex (41, 42), Superior temporal gyrus (38, 22), Middle temporal gyrus (21), Inferior temporal gyrus (20), Fusiform gyrus (37) Medial temporal lobe (Amygdala, Hippocampus, Parahippocampal gyrus (27, 28, 34, 35, 36) | | Cingulate cortex/gyrus | Subgenual area (25), anterior cingulate (24, 32, 33), Posterior cingulate (23, 31), Retrosplenial cortex (26, 29, 30), Supracallosal gyrus | | white matter tracts | Corpus callosum (Splenium, Genu, Rostrum, Tapetum), Septum pellucidum, Internal capsule, Corona radiata, External capsule, Olfactory tract, Fornix (Commissure of fornix), Anterior commissure, Posterior commissure Terminal stria Superior and Inferior longitudinal fasciculus, uncinate fasciculus, cingulum, Inferior occipitofrontal fasciculus | | Basal ganglia | Striatum (Putamen,Caudate nucleus, Nucleus accumbens), Globus pallidus, Claustrum, Subthalamic nucleus, Substantia nigra | | Other | Insular cortex Olfactory bulb, Anterior olfactory nucleus Septal nuclei Basal optic nucleus of Meynert | | Some categorizations are approximations, and some Brodmann areas span gyri. | |