Upper Extremity Muscles

Which muscle is the primary flexor of the elbow joint?

• Biceps brachii

• Triceps brachii

• Brachialis

• Brachioradialis

The brachialis muscle is innervated by the:

• Radial nerve

• Ulnar nerve

• Musculocutaneous nerve

• Median nerve

The ulnar nerve is responsible for innervating the majority of the intrinsic muscles of the hand. Which forearm muscle is innervated by the ulnar nerve?

• Flexor carpi radialis

• Flexor digitorum profundus

• Extensor digitorum

• Brachialis

The deltoid muscle is primarily innervated by which nerve?

• Axillary nerve

• Radial nerve

• Musculocutaneous nerve

• Ulnar nerve

The biceps brachii muscle is innervated by the:

• Musculocutaneous nerve

• Ulnar nerve

• Radial nerve

• Median nerve

What is the primary action of the deltoid muscle?

• Flexion of the elbow

• Abduction of the shoulder

• Extension of the wrist

• Pronation of the forearm

The muscle that forms the bulk of the posterior compartment of the arm and is a powerful extensor of the elbow is the:

• Triceps brachii

• Brachialis

• Biceps brachii

• Brachioradialis

The primary action of the supinator muscle is:

• Pronation of the forearm

• Supination of the forearm

• Flexion of the wrist

• Extension of the fingers

The radial nerve is the primary innervation for which muscle?

• Brachialis

• Brachioradialis

• Triceps brachii

• Biceps brachii

The pronator teres muscle is innervated by the:

• Median nerve

• Ulnar nerve

• Radial nerve

• Musculocutaneous nerve