SPLH 620 Exam #3 Questions and Answers (Graded A+)

motor cortex - ANSWER-controls voluntary movements primary motor cortex - ANSWER--receives sensory input from the cerebellum via. thalamus -sends info. to the spinal cord & brainstem -sends info to corticospinal or corticobulbar tract premotor cortex - ANSWER-The region controlling learned motor skills. -receives input from posterior parietal & visual cortexes lesions in premotor cortex - ANSWER-cause an inability to perform purposeful coordinated actions without a presence of weakness supplementary motor cortex - ANSWER-programming of complex movements -most output goes through M1 (primary motor cortex) -receives input from association areas of parietal & temporal cortex's pyramidal system - ANSWER-the system responsible for controlling voluntary motor movements (fine controlled, skilled, rapid, etc.) extrapyramidal system - ANSWER-controls the postural support for fine motor movement (involuntary) -source of input to LMS's via multiple synapses -smaller, short, "local" circuits corticospinal tract - ANSWER-cerebral cortex to the spinal cord UMN of corticospinal tract... - ANSWER--"first" order neurons -cerebral cortex to spinal cord -descend through internal capsule -decussate @ medulla (brainstem) -synapse in anterior horn of the spinal cord LMN of corticospinal tract - ANSWER--"second" order neurons -cell body of anterior horn synapses with muscle fibers = motor unit corticobulbar tract - ANSWER-Controls all voluntary movement for speech production. Descends from motor cortex through internal capsule but terminates at cranial nerves. -cerebral cortex to brainstem UMN of corticobulbar tract - ANSWER--"first" order neurons -cerebral cortex ---> brainstem -descend down through the internal capsule -synapse on cranial nerve nuclei (CN nuclei) LMN of corticobulbar tract - ANSWER--"second" order neurons -cell body in CN nuclei synapse with muscle fibers = motor unit