Talk:Primary motor cortex

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	This article is within the scope of WikiProject Neuroscience. Please visit the project page for details or ask questions at the talk page.
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I merged precentral gyrus with this article and redirected that page here. If anyone has any comments, please let me know. Semiconscious (talk · home) 09:51, 17 August 2005 (UTC)

[edit] Subdivisions of Primary Motor Cortex

While reading a paper on Betz cells, stumbled upon such lines:

"..and Brodmann’s original delineation of the primary motor cortex has been revised by other investigators, who described an intermediate precentral area, an area precentralis A, area FA� (von Economo and Koskinas, 1925), area 42 (Vogt and Vogt, 1926), area 4� (agranular, containing the Betz cells), area 4a (agranular, devoid of Betz cells), and area 4s (agranular, without Betz cells, but containing large cells in superior part of layer IV (von Bonin, 1949)), and a frontal ganglionic core, all of which are to some extent part of the original description of Brodmann’s area 4. More recent studies have shown that the primary motor cortex can be divided into two different subareas, 4a (anterior) and 4p (posterior), which differ by their cytoarchitecture and distribution of various neurotransmitter binding sites (Geyer et al., 1996)."

Maybe these subdivisions could be included in the article? --CopperKettle 08:09, 26 February 2007 (UTC)