Layers of the Cerebral cortex Flashcards
Enumerate all the layers of the cerebral cortex
Molecular layer (plexiform layer)
External Granular layer
External Pyramidal Layer
Internal Granular layer
Internal Pyramidal layer (ganglionic layer)
Multiform layer (layer of polymorphic cells)
Most superficial which lies directly under the pia mater
Molecular layer/ plexiform layer
Consist of dense network of tangentially oriented nerve fibers.
molecular layer
Large number of synapses between different neurons that occur
molecular layer
Large number of small pyramidal cells and stellate cells
External Granular Layer
existence of small cells in the
layer that gives a granular appearance
granular
Pyramidal = larger pyramidal cells found here
External pyramidal layer
Main input of cortical station
Internal Granular Layer
Most of the stimuli from periphery arrive here
internal granular layer
Closely packed stellate cells (External band of Baillarger) and smaller portion of
pyramidal cells
Internal Granular Layer
Betz cells and medium-sized pyramidal cells
(3% of projection of cortiscopinal tract)
Stellate cells and Cells of Martinotti
Motor activity
Scattered among the pyramidal cells are stellate cells and cells of Martinotti. In addition, a large number of horizontally arranged fibers form the inner band of Baillarger
Internal Pyramidal Layer (Ganglionic Layer)
Although the majority of the cells are fusiform, many of the cells are modified pyramidal cells, whose cell bodies are triangular or ovoid. The cells of Martinotti also are visible bin this layer
Multiform layer (layer of polymorphic cells)
Composed of closely packed stellate cells with a high concentration of horizontally arranged fibers known collectively as the external band of Baillarger
Internal granular layer
It is composed of pyramidal cells whose cell body size increases from the superficial to the deeper borders of the layer.
External pyramidal layer
large pyramidal cells
betz cells
