Forearm and elbow

The chief function of the _____ is to pull the synovial membrane of the elbow joint out of the way of the advancing olecranon process during extension of the elbow.

Anconeus muscle

Which of the following is a posterior upper extremity muscle?

Anconeus muscle

The insertion of the brachioradialis muscle is on the proximal end of the radius at the styloid process.

At the lateral end

Radioulnar supination is performed by all of the following muscles:

Biceps brachii muscle. Supinator muscle. Brachioradialis muscle.

Radioulnar pronation is performed by all of the following muscles except:

Brachialis muscle

Which of the following is not an action of the brachioradialis muscle?

Extension of the elbow

A movement of the forearm away from the shoulder is best described by the term "flexion."

False

In the anatomical position, the radius is medial with respect to the ulna.

False

Lateral epicondylitis is a condition that occurs less commonly than medial epicondylitis.

False

Supination refers to an internal rotary movement of the radius on the ulna.

False

The head of the radius has a large amount of contact with the capitulum of the humerus at the radiocapitellar joint.

False

The scapula and the clavicle serve as proximal attachments for the muscles that flex and extend the elbow.

False

The lateral supracondylar ridge is an anatomical landmark located on the ulna.

False located on the humerus

The olecranon process is located on the medial aspect of the ulna.

False, Superior

The actions of the brachioradialis muscle include:

Flexion of the elbow. Pronation from a supinated position to neutral. Supination from a pronated position to neutral.

Which of the following is an action of the biceps brachii muscle?

Horizontal adduction of the shoulder joint

The long head of the triceps brachii muscle originates from the:

Infraglenoid tubercle below the inferior lip of the glenoid fossa of the scapula.

The elbow includes all of the following ligaments except the:

Interosseus ligament.

Which of the following statements is true about the carrying angle?

It permits the forearms to clear the hips in the swinging movements during walking.

The pronator teres muscle inserts on the:

Middle third of the lateral surface of the radius.

The insertion of the brachialis muscle is on the coracoid process of the ulna.

On the coronoid process of ulna

The elbow joint is a hinge-type joint that allows only internal and external rotations.

Only flexion and extension

The _____ muscle does not perform flexion of the elbow.

Pronator quadratus

In the context of radioulnar joint movements, which of the following terms refers to the external rotary movement of the radius on the ulna that results in the hand moving from the palm-down to the palm-up position?

Supination

Which of the following muscles is involved in both pronation and supination?

The brachioradialis muscle

Which of the following is an anterior upper extremity muscle?

The pronator teres muscle

As the elbow reaches full extension, the olecranon process of the ulna is received by the olecranon fossa of the humerus, and this provides increased joint stability.

True

Elbow motions primarily involve movement between the articular surfaces of the humerus and the ulna.

True

Flexion of the forearm with a barbell in the hands, known as "curling," is an excellent exercise to develop the biceps brachii muscle.

True

In the anatomical position, the tuberosity of the radius is in close proximity to the lateral side of the ulna.

True

Medial epicondylitis is frequently referred to as "golfer's elbow."

True

Positioning the forearm in pronation decreases the effectiveness of the biceps brachii muscle.

True

The biceps brachii muscle originates from the supraglenoid tubercle above the superior lip of the glenoid fossa.

True

The distal attachments of the radioulnar joint muscles are located on the radius.

True

The insertion of the biceps brachii muscle is on the tuberosity of the radius and bicipital aponeurosis.

True

The pronator teres muscle originates from the distal part of the medial supracondylar ridge of the humerus and the medial side of the proximal ulna.

True

The triceps brachii muscle inserts on the olecranon process of the ulna.

True

The ulna is much larger proximally than the radius.

True

The ulnar collateral ligament is critical to providing medial support to prevent the elbow from abducting when stressed in physical activity.

True

Which of the following is the sole action of the brachialis muscle?

True flexion of the elbow

Which of the following is an action of the pronator teres muscle?

Weak flexion of the elbow

Flexion of the elbow occurs in the _____ plane of motion, and supination of the forearm occurs in the _____ plane of motion.

sagittal; transverse