This pages offers a section across the entire thickness primary motor cortex (Brodmann's area 4).
For a higher-magnification overview, click on tall image at right.
The glia limitans is the outermost surface of the brain, immediately beneath the pia mater (which is poorly imaged here).
Designation of the cortical layers I, II, III, IV, V, VI is only approximate. Layers are distinguished by the relative proportions of various cells shapes and fiber distributions; there are no distinct features to serve as "boundaries" for the layers.
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Last updated: 7 December 2003 / dgk