EXS 310 Test 4

Which of the following is the primary function of the extensor digit minimi?

Extension of the little finger at the metacarpophalangeal joint

Which of the following muscles originates on the lateral epicondyle of the humerus?

Extensor digitorum

Wrist joint actions include flexion, extension, abduction (radial flexion), and adduction (ulnar flexion).

True

Which of the following muscles performs abduction of the thumb?

Abductor pollicis longus

Which of the following muscles performs action in the frontal plane?

Abductor pollicus longus

Which of the following is the primary function of the extensor pollicis longus?

Extension of the thumb

Which of the following muscles performs abduction of the wrist?

Extensor carpi radialis longus

Which of the following muscles inserts on the tendons to bases of the middle and distal phalanges of the four fingers on the dorsal surface?

Extensor digitorum

Which of the following is the "pointing muscle" that originates between middle and distal 1/3 of the posterior ulna?

Extensor indicis

Each finger has three interphalangeal joints, whereas the thumb has only two.

False

In the context of wrist and hand movements, radial flexion (abduction) refers to the movement of the thumb side of the hand toward the medial aspect or ulnar side of the forearm.

False

flexor digitorum superficialis is innervated by the ulnar nerve (C8 & T1).

False

Which of the following muscles performs adduction of the wrist?

Flexor carpi ulnaris

Which of the following is the only muscle that flexes the finger distal interphalangeal joint (DIP) joints?

Flexor digitorum profundus

Which of the following muscles does not perform wrist extension?

Flexor pollicis longus

Which of the following is the origin of the flexor carpi radialis muscle?

Medial epicondyle of the humerus

Which of the following is the origin of the palmaris longus?

Medial epicondyle of the humerus

Which of the following is the origin of the flexor digitorum profundus?

Proximal 3/4 of the anterior and medial ulna

Which of the following is the insertion of the extensor carpi ulnaris?

The base of the fifth metacarpal on the dorsal surface

Which of the following is the insertion of the extensor carpi radialis longus?

The base of the second metacarpal on the dorsal surface

Which of the following is the insertion of the extensor carpi radialis brevis?

The base of the third metacarpal on the dorsal surface

In the context of wrist and hand movements, opposition refers to the movement of the thumb across the palmar aspect to oppose any or all of the phalanges.

True

The extensor carpi ulnaris and the flexor carpi ulnaris are the only muscles involved in ulnar deviation (adduction).

True

The extensor digitorum is the only muscle involved in extension of all four fingers.

True

The three wrist flexors, form medial to lateral, are the flexor carpi ulnaris, palmaris longus, and flexor carpi radialis.

True

The wrist flexor muscles have their origin on the medial epicondyle of the humerus.

True

To stretch the flexor carpi ulnaris, the elbow must be fully extended with the forearm supinated while a partner passively extends and abducts the wrist.

True

carpal tunnel syndrome is a condition in which there is an increased pressure in the carpal tunnel, which interferes with the normal function of the median nerve.

True

extensor digiti minimi is innervated by the radial nerve (C6-C8).

True

flexor pollicis longus inserts on the base of the distal phalanx of the thumb on the palmaris surface.

True