ASU BIO 467 Summer - Module 5 Lecture + Quiz with complete solutions

ASU BIO 467 Summer | Module 5 Lecture
+ Quiz


local circuit neurons

a neuron that communicates with neurons in its immediate vicinity; sensorimotor
integration and central pattern recognition and receive incoming sensory input




Motor neuron pools consist of __________.

lower motor neurons and communicate with skeletal muscle; all the motor
neurons for a single muscle




Motor neuron pools receive information from ___________.

descending systems of upper motor neurons; the motor cortex and brainstem

Lower Motor Neurons (LMN)

,Efferent neurons of the PNS that synapse to control skeletal muscle; cholinergic
neurons




A motor unit consists of _________.

a single ALPHA motor neuron innervating multiple muscle fibers




Alpha motor neurons

Large, innervate extrafusal fibers (contractile fibers)




Gamma motor neurons

Small, innervate intrafusal fibers (muscle spindles)




Nerves which innervate the distal limbs are located in the _________ also called
the ________.

lateral ventral horn, lateral motor column

, Nerves which innervate the proximal (axial) muscles are located in the ________
also called the _______.

medial ventral horn, medial motor column




slow motor units (S)

alpha MN which is fatigue resistant, little force, important for postural control,
first in the chain of recruitment (dictated by the size principle)




fast fatigue resistant motor units (FR)

alpha MN which is middle ground; moderately fatigue resistant, moderate
amount of force output, 2nd in the chain of recruitment (dictated by the size
principle)




fast fatigable motor units (FF)