PSYC 2200 Lecture Notes - Lecture 16: Peripheral Nervous System, Oliver Sacks, Botulism
22 Oct 2020
School
Department
Course
Professor
Document Summary
Controlled via brain and pyramidal and extra-pyramidal systems (spinal and cranial. Controlled via brain and enteric, sympathetic, and parasympathetic autonomic systems. The motor command of skeletal and branchial muscles is monosynaptic (involving only one motor neuron, respectively, somatic and branchial, which synapses onto the muscle. The command of visceral muscles is disynaptic (involving 2 neurons: the general visceral motor neuron located in the cns, which synapses onto a ganglionic neuron, located in the pns, which synapses onto the muscle. Neuron from left motor cortex, cross over middle of pons, then end on right of spinal cord. Voluntary motor signals stimulate smooth muscle through a division of the peripheral nervous system. Occurs due to stimulation at the neuromuscular junction, where excitatory acetylcholine leads to changes in ion channels (potentials), and the sliding of actin/myosin protein molecules over each other to contract the muscle. Pyramidal motor system (corticospinal tract) direct , fast descending output.
