Brodmann area 13

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Brodmann area 13
Brodmann areas of frontal cortex of monkey brain (Cebus apella).jpg
Frontal cortex of Sapajus sp. BA13 is shown in the diagram at right (orbital surface).
NeuroLex IDbirnlex_1744
Anatomical terms of neuroanatomy

Brodmann area 13 is a subdivision of the cerebral cortex as defined on the guenon monkey and on the basis of cytoarchitecture.[1] Brodmann area 13 is found in humans as part of the insula[2]. This structure lies between the lateral and medial layers of the brain. Thus it is sometimes misidentified as not being a Brodmann area.


Located in the anterior part of the insular cortex, Brodmann area 13 shares with other parts of the insular cortex a wide molecular layer (I) and very wide multiform layer (VI).[1]


The external granular layer (II) is relatively dense. The external lamina pyramidalis externa (III) has a central stripe of less cellular density that separates two sublayers, IIIa and IIIb. The internal granular layer (IV) is sufficiently wide and dense to separate clearly sublayer IIIb from layer V. The boundary between layers V and VI is defined by larger ganglion cells, more pyramidal in shape, in layer V giving way to smaller, more spindle-shaped cells that become denser and more homogeneous deeper in layer VI. Often the spindle cells are arrayed horizontally as in the claustrum (VICl), which Brodmann considered a likely extension of layer VI beyond the extreme capsule (VICe) (Brodmann-1905).

See also[edit]


  1. ^ a b "area 13 of Brodmann (guenon)". University of Washington. Retrieved 3 June 2010.
  2. ^ Neuroanatomy, text and atlas, John H. Martin, 3rd edition, page 49.

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