EHS 230 Lecture Notes - Lecture 3: Afferent Nerve Fiber, Efferent Nerve Fiber, Golgi Tendon Organ
11 Mar 2017
School
Department
Course
Professor
Document Summary
Topics: basic principles of neuromuscular anatomy and physiology. Motor unit involves a motor neuron and every muscle it controls. Motor neuron- a nerve that goes from spinal cord to the muscle it is targeting. When it is fired, all the muscle fibers it controls are activated. Precision muscles- have 1 to 1 ratio of muscle fibers and motor neurons. Fibers from large muscle groups have many fibers that are controlled by one neuron. Motor unites are activated when acetylcholine is released by motor endplates. This allows for the sarcolemma to be activated and muscle fibers contract. All or none principle- all muscle fibers are activated when there is enough power to stimulate a fiber. Small activation period where muscle fibers are engaged inside a motor neuron. If there is a second twitch activated before a fiber is relaxed the power created becomes stronger. Shortening the time between both twitches equals more force created.
