GSU NEUR 3000 - NEUR 3000 - Chapter 13 (42 pages)

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NEUR 3000 - Chapter 13



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NEUR 3000 - Chapter 13

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Pages:
42
School:
Georgia State University
Course:
Neur 3000 - Hon Principles of Neuroscience

Unformatted text preview:

SPINAL CONTROL OF MOVEMENT NEUR 3000 Dr Joseph J Normandin THE MOTOR SYSTEM Consists of all of the muscles of the body and the neurons that control them Produces behavior through highly coordinated neuromuscular activity Much of this activity is coordinated by circuitry within the spinal cord Command and control of the muscles The brain interacts with the spinal cord to execute and modify spinal cord command Command and control of the spinal cord THE SOMATIC MOTOR SYSTEM The somatic motor system includes all of the skeletal muscles of the body and the neurons that control them This excludes smooth muscle cardiac muscle the visceral motor system Skeletal muscles are connected to bone by tendons and exert force on bones to move body parts Muscles are made of muscle cells also called muscle fibers which are excitable THE SOMATIC MOTOR SYSTEM LOWER MOTOR NEURONS The somatic musculature is innervated by somatic motor neurons Also called lower motor neurons Cell bodies are located in the ventral horn of the spinal cord Axons exit through the ventral root LOWER MOTOR NEURONS LOWER MOTOR NEURONS There are two types of lower motor neurons Alpha motor neurons Directly trigger the generation of force on muscles that we think of as movement Gama motor neurons Will be discussed later ALPHA MOTOR NEURONS ALPHA MOTOR NEURONS Alpha motor neurons are able to control muscle contraction in a graded fashion The synapse between a motor neuron and a muscle is the neuromuscular junction Acetylcholine and the nicotinic acetylcholine receptor are used here One motor neuron AP muscle fiber End Plate Potential EPP twitch contract relax Sustained contraction requires a continual barrage of APs EPPs are summed graded contraction More alpha motor neurons more contraction further graded ALPHA MOTOR NEURONS ALPHA MOTOR NEURONS Alpha motor neurons are able to control muscle contraction in a graded fashion The proportion of innervation by each motor neuron can result in fine or gross control One



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