AAO Exam 2 Prep (Elbow, Wrist, Hand)

The elbow joint is the articulation of the humerus with the ulna and the (a)   .

The radioulnar joint is a uniaxial _____ joint.

• Pivot

• Hinge

• Ball-and-socket

• Saddle

The radioulnar joint motions move in the _____ plane, around the _____ axis.

• Transverse, vertical

• Transverse, frontal

• Sagittal, frontal

• Frontal, sagittal

Answer explanation

The joint motions associated with the radioulnar joint are pronation and supination.

The carrying angle is formed by the longitudinal axes of the humerus and forearm. This angle tends to be greater in men than women.

• True

• False

Answer explanation

The carrying angle is formed by the longitudinal axes of the humerus and forearm. This angle tends to be greater in women than men.

Women: 10 to 15 degrees

Men: 5 degrees

Occurs because the distal end of the humerus is not level.

The distal end of the humerus has two convex areas: the ______ articulating with the ulna, and the ______ articulating with the radius.

• trochlea, capitulum

• capitulum, trochlea

• medial epicondyle, lateral epicondyle

• olecranon, lateral epicondyle

Tags

NGSS.MS-LS4-2

The tendon of the biceps cross the elbow joint anteriorly to attach medially on the radial tuberosity.

• True

• False

The contraction of the (a)   pulls the radius laterally to bring the radial insertion back to the anterior position.

What are the prime movers of forearm supination?

• Supinator and biceps

• Supinator and brachialis

• Supinator and brachioradialis

• Supinator and triceps brachii

To test the strength of the brachioradialis muscle, the forearm is in _____.

• Supination

• Pronation

• Mid position

To test the strength of the brachialis muscle, the forearm is in _____.

• Pronation

• Supination

• Mid position