Calcarine fissure

Calcarine fissure

Infobox Brain
Name = PAGENAME
Latin = sulcus calcarinus, fissura calcarina
GraySubject = 189
GrayPage = 820


Caption = Medial surface of left cerebral hemisphere. ("Calcarine fissure" visible at left.)


Caption2 = Coronal section through posterior cornua of lateral ventricle. (Label for "Calcarine fissure" visible at bottom.
IsPartOf = Occipital lobe
Components =
Artery = calcarine branch of medial occipital artery
Vein =
BrainInfoType = hier
BrainInfoNumber = 25
MeshName =
MeshNumber =
DorlandsPre = s_28
DorlandsSuf = 12768398
The calcarine fissure (or calcarine sulcus) is an anatomical landmark located at the very caudal end of the medial surface of the brain.

Anatomy

The calcarine sulcus 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.

Function

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. [cite journal |author=Wong A, Sharpe J |title=Representation of the visual field in the human occipital cortex: a magnetic resonance imaging and perimetric correlation |journal=Arch. Ophthalmol. |volume=117 |issue=2 |pages=208–17 |year=1999 |pmid=10037566] This is known as cortical magnification.

References

External links

*
* http://www2.umdnj.edu/~neuro/studyaid/Practical2000/Q31.htm
* - "The Visual Pathway from Below"


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  • calcarine fissure — noun a sulcus in the mesial surface of the occipital lobe of the cerebrum • Syn: ↑calcarine sulcus • Hypernyms: ↑sulcus • Part Holonyms: ↑occipital lobe, ↑occipital cortex * * * noun …   Useful english dictionary

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  • calcarine sulcus — n a sulcus in the mesial surface of the occipital lobe of the cerebrum called also calcarine fissure * * * sulcus calcarinus [TA] a sulcus on the medial surface of the occipital lobe, separating the cuneus from the lingual gyrus; called also… …   Medical dictionary

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  • calcarine sulcus — noun a sulcus in the mesial surface of the occipital lobe of the cerebrum • Syn: ↑calcarine fissure • Hypernyms: ↑sulcus • Part Holonyms: ↑occipital lobe, ↑occipital cortex …   Useful english dictionary

  • Fissure — A cleft or groove. A fissure can be normal or abnormal. A fissure in the cerebral cortex is a normal feature. It is a deep fold that involves the entire thickness of the brain wall. A fissure in the anus is distinctly abnormal. It is a painful… …   Medical dictionary

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  • Parietoöccipital fissure — Infobox Brain Name = PAGENAME Latin = fissura parietooccipitalis GraySubject = 189 GrayPage = 820 Caption = Fig. 726: Lateral surface of left cerebral hemisphere, viewed from the side. Caption2 = Fig. 727: Medial surface of left cerebral… …   Wikipedia

  • collateral fissure — noun : a fissure of the tentorial surface of the cerebrum lying below and external to the calcarine fissure and causing an elevation on the floor of the lateral ventricle between the hippocampi …   Useful english dictionary

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