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Encyclopedia > Calcarine fissure
Brain: Calcarine fissure
Medial surface of left cerebral hemisphere. ("Calcarine fissure" visible at left.)
Coronal section through posterior cornua of lateral ventricle. (Label for "Calcarine fissure" visible at bottom.
Latin sulcus calcarinus, fissura calcarina
Gray's subject #189 820
Part of Occipital lobe
Artery calcarine branch of medial occipital artery
NeuroNames hier-25
Dorlands/Elsevier s_28/12768398

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. ... Elseviers logo. ... 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

  1. ^ 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


  Results from FactBites:
 
IX. Neurology. 4e. Composition and Central Connections of the Spinal Nerves. Gray, Henry. 1918. Anatomy of the Human ... (8263 words)
This center is connected with the one in the opposite side by commissural fibers which course in the optic radiation and the splenium of the corpus callosum.
The dentate gyrus which may be considered as a modified part of the hippocampus is partially separated from the gyrus hippocampus by the hippocampal fissure and from the fimbria by the fimbrio-dentate sulcus; it is intimately connected with the hippocampal gyrus and the hippocampus.
The white matter of the indusium known as the medial longitudinal striæ (nerves of Lancisi) and the lateral longitudinal striæ, are related to the indusium somewhat as the cingulum is to the gyrus cinguli.
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