Frontal Lobes Flashcards
What are the 6 major structures?
– Primary Motor
– Supplemental Motor – Premotor
– Frontal Eye Fields
– Prefrontal
– Basomedial (orbitofrontal)
Primary Motor Area
Located on precentral gyrus; Rate of firing correlated with force; Somatotopic organization – Feet up high – Head down low.
Motor Homunculus
A variable representation of your body on your brain; Some regions of body have more representation that others
Lesions
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.
What’s the difference between hemiplegia and hemiparesis?
Hemiplegia is a Complete loss of strength, movement, paralysis
Hemiparesis is just a Loss of strength, weakness
Supplemental Motor Area
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.
Programming
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