Physiology 2130 Study Guide - Intrafusal Muscle Fiber, Golgi Tendon Organ, Muscle Spindle

• School: Western University
• Department: Physiology
• Course: Physiology 2130
• Professor: Unknown

Document Summary

The basic unit for motor movement is the motor unit: consists of the alpha-motor neuron and any muscle cell it comes into contact with. To preform a movement we need to know: Which muscle group to use length of the muscles it will move - muscle spindles tension in the muscle it will move- gto. The brain knows which muscle to use to preform movement as we learned through experience as we develop. The brain gains info about length and tension of a muscle through proprioceptors: Alpha mn: innervate extrafusal muscle fibers, responsible for initiation contraction (skeletal muscle) Gamma mn: used to process muscle contraction (muscle spindle) Runs in parallel with extrafusal muscle fibres and contains info about length and change in length. Intrafusal muscle fiber: made of muscle spindle (stretch) Extrafusal muscle fiber: made of muscle fiber (tension) A reflex is an involuntary response to a stimulus, which requires the integrity of the nervous system.