Chapter 13, Problem 1GAQ

a.

Summary Introduction

To determine: The finger and thumb motions that occur in the frontal plane around the sagittal axis.

Introduction: The hand comprises the phalanges, the thumb, and the metacarpals of the finger. It is at the upper extremity's distal end and the main point for functioning of the upper extremity.

Explanation of Solution

There are motions of the finger that occur around the axis that is sagittal and on the frontal plane, there includes metacarpophalangeal adduction or abduction. The thumb motions include carpometacarpal, metacarpophalangeal, and interphalangeal extension and flexion.

b.

Summary Introduction

To determine: The finger and thumb motions that occur in the sagittal plane around the frontal axis.

Explanation of Solution

There are motions of the finger that occur around the axis that is frontal and on the sagittal plane are metacarpophalangeal, proximal interphalangeal, and distal interphalangeal extension and flexion. The motions of the thumb are basically carpometacarpal reposition and opposition.

c.

Summary Introduction

To determine: The finger and thumb motions that occur in the transverse plane around the vertical axis.

Explanation of Solution

There are no motions of the finger that occur in the transverse plane around the axis that is vertical. The motions of thumb include reposition and opposition movements of the carpometacarpal joint.