C J Long Overview of Topics - Trace the pyramidal system and
discuss its basic function. - Discuss the similarities and
differences between the pyramidal and extrapyramidal systems. -
Explain the basic differences between the neostriatum and
paleostriatum. - Explain the importance of the substantia nigra
in extrapyramidal functions. - Explain the function of the
COEPS. - Definition: motor system with cell bodies in cortex &
axons terminating directly on the motor neuron pool. - Betz
cells in motor cortex make up only 3% of this tract. - Thought
to be voluntary motor system while extrapyramidal is involuntary
- Involved in instigating, terminating, and altering movement. -
Functions to relate behavior to environment by use of sensory
feedback. - Precentral gyrus controls individual movements -
Premotor region (plan & integration of sequences of movements) -
Motor homunculus -- Organization inverted -- head at bottom -
Motor cortex area conforms to innervation ratio - Muscle vs.
movement localization controvers