Frontal Lobes

Question 1

What are the 6 major structures?

Answer 1

– Primary Motor
– Supplemental Motor – Premotor
– Frontal Eye Fields
– Prefrontal
– Basomedial (orbitofrontal)

Question 2

Primary Motor Area

Answer 2

Located on precentral gyrus; Rate of firing correlated with force; Somatotopic organization – Feet up high – Head down low.

Question 3

Motor Homunculus

Answer 3

A variable representation of your body on your brain; Some regions of body have more representation that others

Question 4

Lesions

Answer 4

Fine movements, speed, and strength; Chronic loss of ability to make fine, independent finger movements and Loss of motor speed; Strength as well, all contralateral to side of lesion.

Question 5

What’s the difference between hemiplegia and hemiparesis?

Answer 5

Hemiplegia is a Complete loss of strength, movement, paralysis
Hemiparesis is just a Loss of strength, weakness

Question 6

Supplemental Motor Area

Answer 6

Medial and some lateral aspect of cortex; Reciprocal connections to primary motor, premotor, and somatosensory; Important for the temporal organization of movement; And in tasks that require retrieval of motor memory.

Question 7

Programming

Answer 7

Integration of: External input, commands, stimuli. Initiating the appropriate motor responses for these. Important for planning complex movements » And Coordinating movements.Facilitates and formulation of movement strategy.
• Activates with imagined movement
– Thinking about or imagining moving body part
• Preparation of movement