Cortex and Ways of organizing the cortex

Question 1

Fissure

Answer 1

Deep and sulcus - shallow

Question 2

Gyrus

Answer 2

ridge or wrinkle

Question 3

Central sulcus, lateral fissure, medial longitudinal fissure

Answer 3

that’s all

Question 4

Projection map

Answer 4

• Primary projection areas: sensory and motor
• Secondary projection areas – projections to and from adjacent area
• Association areas – between secondary areas – responsible for higher-level cognitive functions

Question 5

Cytoarchitectonic map

Answer 5

• 6 layers of cortex. Each has different types of cells. Different layers are prominent in different parts of the brain depending on the area’s function.
• 5 & 6 send axons to other brain areas. Cells are large. Prominent in the motor cortex.
• 4 receives axons from other areas of the brain. Densely packed small cells. Prominent in primary sensory areas.
• 1, 2 & 3 receive input primarily from layer 4. Prominent in secondary projection and association areas.
• Brodmann’s areas based on cytoarchitectonics.

Question 6

Functional map

Answer 6

• Brain electrically stimulated and the person’s response in noted.
• Imaging techniques  PET, fMRI
• Homunculus