PSYCH261 Lecture Notes - Pallidotomy, Cerebellar Vermis, Motor System

• School: University of Waterloo
• Department: Psychology
• Course: PSYCH261
• Professor: Deltcho Valtchanov

Document Summary

*effectors e. g. , the hands (distal) or neck (proximal); somethin that allows you intearact with your environment. *muscles arranged in agonist / antagonist pairs e. g. , biceps and triceps (facilitating vs. preventing function) *primary site of interaction between muscles and the cns is via alpha motor neurons (nicotinic ach receptors) *extrafusal muscle fibers responsible for force exerted by contraction of skeletal muscle; resp for physical action. *alpha motor neuron neuron whose axon synapses with extrafusal muscle fibers; muscle sensors; attched to extrafusal. *intrafusal muscle fibers functions as a stretch receptor; have. *gamma motor neuron neuron whose axons synapse with intrafusal muscle fibers; sensing the strecthing of intrafusal. *alpha motor neurons originate in the spinal cord, exit via the ventral root and terminate at extrafusal muscle fibres. *acetylcholine (nicotinic receptors) is the neurotransmitter released by action potentials in alpha motor neurons; primary neurotransmitter for the muscles. *patella stretches quads which contract kicking your foot out.