Kinesiology 1080A/B Lecture Notes - Gamma Motor Neuron, Facial Nerve Paralysis, Myocyte

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 1080A/B
• Professor: Prof

Document Summary

Influences alpha motor neurons that control lower facial muscle: mononeurpathy involving lower motor neurons specifically impact one neuron, unilateral facial nerve paralysis, can see it bilateral, not chronic but is specific with specific impairments. Innervation the distribution of neurons to a part of the body. Innervation ratio the number of muscle fibres innervated by a single alpha motor neurons; can vary from a few to a thousand. Extrafusal fibres power producing muscle fibres external with respect to muscle spindles. Intrafusal fibres muscle fibres inside of the muscle spindles; innervated by a system of fusimotor neurons (y-motor neurons) Alpha motor neuron a neuron innervating power producing, extrafusal muscle fibre. Motor unit alpha motor neuron and all the muscles it innervates; a unit of force production in skeletal muscles. Number of muscle fibres associated with a motor unit ranges from 10 (eye) to thousands (back muscles) Motor neuron pool consist of many alpha and extrafusal fibres they innervate.