Sou's brain activation

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2024/04/20 (Sat.)

Structure of Neocortex (大脳新皮質の構造)

Cerebrum has a role of decision-making.
In this page, I explain the structure of Brain Cortex.

Brain Cortex, especially Neocortex has six-layered structure.
In contrast, Limbic Cortex has three.
(And more precisely, In Neocortex, Association Area is clearly divided into six layers, but Sensorial Area or Motor Area the boundaries are fuzzy. )

By this structure, these regions can different functions at the same time.

Furthermore, Neocortex are composed of column-shaped assemblies of neurons.(0.5 mm width and 2 or 3 mm height)
Each Assembly’s neurons have functionally common property.
This assembly is called "Column" and it is fundmental unit.
And to extend the area, Neocortex has wrinkles or sulci.

If that helps, in the early 20th century,
Brodmann (German analyst) classified Neocortex into 52 parts by examining the layered structure, kind of neurons, alignment, and density.

So the classification is called “Brodmann’s Brain Map”




▲Outer surface

▲Inner surface

2010/07/15 (Thu.) Trackback() Comment(0) Brain