KINE 3020 Lecture Notes - Lecture 3: Alpha Motor Neuron, Golgi Tendon Organ, Mitochondrion

18 views13 pages
Topic 3: Sensory Motor Systems 1: Control of Muscle
Muscle Contraction
Motor Units
o 1 motor neuron + multiple muscle fibers
Motor Neuron Pools
o multiple Motor Units which innervate 1 type muscle
Extrafusal Muscle Fibers
o α Motor Neurons
Intrafusal Muscle Fibers
o γ Motor Neurons
How do we get out muscles to move?
by Muscle Control (how to control)
with the same muscles
//
Unlock document

This preview shows pages 1-3 of the document.
Unlock all 13 pages and 3 million more documents.

Already have an account? Log in
Inputs to Motor Neurons
α Motor Neurons
o In the Ventral Horn of the Spinal Cord
o Connects to the Muscle Fibers
o Inputs from the diverse sources
Last neuron connects to the Muscles
Spinal Interneurons
o Dorsal Horn & Intermediate Horn
Intermediate Horn : between Doral & Ventral Horns
o Motor Command + Sensory inputs
Unlock document

This preview shows pages 1-3 of the document.
Unlock all 13 pages and 3 million more documents.

Already have an account? Log in
Motor Units
3 Motor Neurons in the Ventral Horn
o one Motor Neuron … many Muscle Fibers
o Each Motor Neuron controls
different set of the Muscle Fibers within the Same Muscle Group
Each Axon splits up at terminal & synapse multiple muscle fibers
Motor Unit
o Single Motor Neuron + Extrafusal Muscle Fibers that a motor neuron innervates
3 (extrafusal) muscle fibers ~ 1000 (extrafusal) muscle fibers
Some of them depend on the size of the muscle group
Unlock document

This preview shows pages 1-3 of the document.
Unlock all 13 pages and 3 million more documents.

Already have an account? Log in

Get access

Grade+
$10 USD/m
Billed $120 USD annually
Homework Help
Class Notes
Textbook Notes
40 Verified Answers
Study Guides
1 Booster Class
Class+
$8 USD/m
Billed $96 USD annually
Homework Help
Class Notes
Textbook Notes
30 Verified Answers
Study Guides
1 Booster Class