Kinesiology 1080A/B Lecture Notes - Lecture 13: Alpha Motor Neuron, Muscle Spindle, Motor Neuron

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

Document Summary

Seizures due to deep tumor in the brain. Innervation the distribution of nerves to a part of the body. Innervation ratio the number of muscle fibres innervation by a single alpha motor neuron; can vary from a few to over a thousand: extrafusal fibres power producing muscle fibres external with respect to muscle. Intrafusal fibres send sensory info back into spinal cord via dorsal route ganglia. Monosynaptic connection implies that the info provided by the muscle spindle to modulate the activity of an alpha motor neuron (fastest reflex loop in the human body) Alpha motor neuron = a neuron that innervates power-producing, extrafusal muscles fibre. Motor unit composed of an alpha motor neuron and al of the muscle fibres that it innervates; a unit of force production in skeletal muscles. Much larger than y-motor neurons (large diameter fibres, heavily myelinated) have higher conduction velocities.