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Cerebral cortex layers microanatomy

Cerebral Cortex Layers (Microanatomy) Simplified

Dr. Sulabh Kumar Shrestha, MS Orthopedics, Jul 30, 2016Jul 30, 2016

Last updated on July 30, 2016

The neocortex have 6 layers and allocortex have only 3 layers.

Cerebral cortex layers microanatomy

The 6 layers of Neocortex:

Orientation of layers:

  • Outer: Towards meaninges
  • Inner: Towards white matter

Idea about the layers:

  • Molecular or plexiform: Only cell processes
  • Granular layer: Densely packed stellate cells
  • Pyramidal layer: Medium and Large pyramidal cells
  • Multiform layer: Different types of cells
  • Pyramidal cells are absent in inner granular layer
LayersComponentsAfferentsEfferents
I – MolecularAxons and Dendrites (Cell processes)From other regions of Cortex and BrainstemTo other regions of cortex

(Intra-cortical

Association functions)

II – External granularDensely packed Stellate cells + Small pyramidal cells
III – External pyramidalLoosely packed Stellate cells + Medium pyramidal cells
IV – Internal granularDensely packed Stellate cells only+ From Thalamus
V – Internal pyramidalLarge pyramidal cells only (few stellate cells) – Giant Pyramidal cells of Betz+ From Brain stemTo Brain stem & Spinal cord (Projection fibers)
VI – MultiformMultiple sized pyramidal cells + Loosely packed stellate cellsTo Thalamus

The 3 layers of allocortex:

  1. Molecular layer
  2. Pyramidal layer
  3. Multiform layer

Allocortex is found in: Limbic system

  1. Olfactory cortex
  2. Hippocampal formation
  3. Subiculum

Mesocortex: A transitional type of 3 to 6-layered cortex between neocortex and allocortex –

  1. Parahippocampal gyrus
  2. Pre- and Para-subiculum
  3. Insula

real cortex

Neurons of the cortex:

  1. Pyramidal cells:
    • Large layer V pyramidal cells project axons to brainstem and spinal cord.
    • Smaller layer II and III pyramidal cells project axons to other cortical areas.
  2. Stellate cells: Interneurons whose axons remain within the cortex
  3. Fusiform cells (in deeper layers): Gives rise to corticothalamic projections
  4. Horizontal cells of Cajal
  5. Cells of Martinotti

Bands of Baillarger: Formed by high concentration of horizontally arranged nerve fibers.

  • External band: In layer IV
  • Internal band: In layer V

 

dr. sulabh kumar shrestha
Dr. Sulabh Kumar Shrestha, MS Orthopedics

He is the section editor of Orthopedics in Epomedicine. He searches for and share simpler ways to make complicated medical topics simple. He also loves writing poetry, listening and playing music.

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PGMEE, MRCS, USMLE, MBBS, MD/MS AnatomyNervous system

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Shrestha SK. Cerebral Cortex Layers (Microanatomy) Simplified [Internet]. Epomedicine; 2016 Jul 30 [cited 2025 May 22]. Available from: https://epomedicine.com/medical-students/cerebral-cortex-layers-microanatomy-simplified/.

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