Cortex Histology Flashcards
Cortical Layers
1) Molecular/Plexiform layer
- Dendrites of pyramidal cells and axons.
2) Outer Granular layer
- Dense cell layer of Granular and Stellate cells
3) Outer Pyramidal layer
- Loose cell layer of Medium sized pyramidal cells
4) Inner Granular layer
- Dense layer of Granular and Stellate cells
5) Inner Pyramidal Layer (Ganglionic Layer)
- Large/Giant Pyramidal cells of Betz
6) Multiform cell layer
- Small neurons and polymorphic cells of various sizes and shapes
Layers 2 and 4 ( the Granular layers are predominant in Sensory cortical layers
Layer 5, the Inner pyramidal layer is dominant in the Motor cortex.
Neocortex
Definition and alternate names
Isocortex, Neopallium
6 layered cortex
Allocortex
Cortex with less than 6 layers
Subtypes:
Paleocortex: 3-5 layers Olfactory Bulb, Parahippocampal Gyrus, Anterior Perforated Substance, Periamygdala area
Archicortex: 3 layers
Hippocampus.
Primary Olfactory Cortex .
Periallocortex: Transitional zone between neocortex and allocortex.
The two main types of cortex
Neocortex and Allocortex
Primary somatosensory cortex BA
BA 3-1-2
Primary Motor Cortex BA
BA 4
Frontal Eye Feild BA
BA 8
Premotor cortex BA
BA 6
Primary and Secondary Auditory BA
41 and 42, transverse gyri of Hescl
Primary Visual BA
V1, BA 17
Secondary, extrastriate areas, BA
BA 18, BA 19
Primary Olfactory Area BA
the Periamygdaloid/Temporal region, BA 51
Primary Gustatory cortex
BA 43, Temporal operculum.
