Functional Subdivisions of Frontal Lobe

Question 1

Primary Motor Cortex

Answer 1

• Origin of descending tracts controlling voluntary movement
• Precentral gyrus

Question 2

Premotor and Supplementary Motor areas

Answer 2

• Initiation of voluntary movement

- precentral gyrus and adjacent portions of superior and middle frontal gyri

Question 3

Broca’s area

Answer 3

• Language production (spoken and written)

- opercular and triangular parts of inferior frontal gyrus (usually left side only)

Question 4

Prefrontal cortex

Answer 4

• Executive functions (personality, insight, foresight)

- Remainder of frontal lobe