The semioval center or centrum semiovale is the white matter

White matter

White matter is one of the two components of the central nervous system and consists mostly of myelinated axons. White matter tissue of the freshly cut brain appears pinkish white to the naked eye because myelin is composed largely of lipid tissue veined with capillaries. Its white color is due to...

 found underneath the grey matter

Grey matter

Grey matter is a major component of the central nervous system, consisting of neuronal cell bodies, neuropil , glial cells and capillaries. Grey matter contains neural cell bodies, in contrast to white matter, which does not and mostly contains myelinated axon tracts...

 on the surface of the cerebrum. The term is synonymous with cerebral white matter.

The white matter, located in each hemisphere between the cerebral cortex

Cerebral cortex

The cerebral cortex is a sheet of neural tissue that is outermost to the cerebrum of the mammalian brain. It plays a key role in memory, attention, perceptual awareness, thought, language, and consciousness. It is constituted of up to six horizontal layers, each of which has a different...

 and nuclei, as a whole has a semioval shape. It consists of cortical projection fibers

Projection fibers

The projection fibers consist of efferent and afferent fibers uniting the cortex with the lower parts of the brain and with the spinal cord.-Efferent:The principal efferent strands are:...

, association fibers and cortical fibers.

External links

• http://www.anatomyatlases.org/MicroscopicAnatomy/Section17/Plate17351.shtml
• http://www.med.harvard.edu/AANLIB/cases/caseB/054t_2.gif
• http://www.dartmouth.edu/~btharris/Case_of_Quarter/Case_4/case_4_home.htm (see figure 4)
• http://www.sylvius.com/index/c/centrum_semiovale.html