Neuroanatomy Draw It To Know It

16. Cerebral Gray Matter 283

I. Molecular

II. External granular

III. External pyramidal

IV. Internal granular

V. Internal pyramidal

VI. Multiform

Cell sparse, primarily axons

& dendrites

Non-pyramidal &

few small pyramidal cells

Pyramidal cells

of varying sizes

Non-pyramidal cells &

external band of Baillarger

Large pyramidal cells &

internal band of Baillarger

Multitude of cell types, blends

into underlying white matter

LAYER HISTOLOGY

Pyramidal cells - 10 to 80 μm; example - Betz cell

Non-pyramidal cells - 5 to 15 μm; example - stellate cells

NEOCORTICAL CYTOARCHITECTURE

NEOCORTEX

ALLOCORTEX

MESOCORTEX

(Isocortex)

Paleocortex

Archicortex

Periallocortex

Proisocortex

Peripaleocortex

Periarchicortex

CORTICAL CLASSIFICATION

CELL NOMENCLATURE

DRAWING 16-5 Cerebral Cytoarchitecture