Chapter 10, Problem 1CYU

Summary Introduction

To review:

Whether large motor units are present in the postural muscles of the back or the muscles of the hand. Also, mention the rationale behind this.

Introduction:

A motor unit of the muscle comprises a motor neuron and skeletal muscle fibers innervated by the axon terminals of the motor neuron. The size of the motor unit depends on the factors like type of muscle, type of work accomplished by the muscle, and location of the muscle. Fine control of the movements is important in determining the size of a motor unit.