Unit Four: The Wrist and Hand Flashcards
What innervates the brachioradialis and triceps brachii?
The radial nerve.
What is the action of the pronator teres?
To pronate the forearm.
What is the action of the palmaris longus?
Weak wrist flexor.
What is the action of the flexor digitorum superficialis?
Flexes wrist at the PIP joints (and the 2nd to 5th MP joints).
What is the MP joint?
The metacarpophalangeal (MP) joint
What is the IP joint?
The interphalangeal joint.
What is the action of the flexor pollicis longus?
To flex the MP and IP joint at the thumb
What does pollicis/pollex mean?
Thumb.
What is the action of the flexor digitorium profundus? (2)
- Flexes the wrist. 2. Flexes the 2nd to 5th MP, IP, and DP joints.
What innervates the medial portion of the flexor digitorium profundus?
The ulnar nerve.
What innervates the lateral portion of the flexor digitorium profundus?
The median nerve.
Where does the pronator teres originate and insert?
- It originates on the medial epicondyle of the humerus. 2. It inserts on the lateral radius.
What is the action of the pronator quadratus?
To pronate the forearm.
What innervates the pronator quadratus?
The median nerve.
What is the action of the extensor carpi radialis longus and extensor carpi radialis brevis? (2)
- Extend the wrist. 2. Abducts the hand.
What is the action of the extensor digitorum? (2)
- Extends wrist. 2. Extends 2nd to 5th MP, PIP, and DP joints.
What is the action of the extensor digiti minimi? (2)
- Extends wrist. 2. Extends MP and PIP joints of finger 5.
What is the action of the extensor carpi ulnaris? (2)
- Extends wrist. 2. Adducts hands.
What is the action of the abductor pollicis longus?
To abduct the thumb.
What is the action of the extensor pollicis brevis?
Extends MP joints of thumb.
What is the action of the extensor pollicis longus?
Extends the MP and IP joints of the thumb.
What is the action of the extensor indicis?
Extends MP, PIP, and DIP joints of finger 2 (index).
What is the action of the supinator?
To supinate the forearm.
What is the action of the flexor pollicis brevis?
To flex the thumb.
What is the action of the abductor pollicis brevis?
To abduct the thumb.
What is the action of the opponens pollicis?
To oppose the thumb.
What is the function of the flexor digiti minimi?
To flex finger 5.
What is the function of the abductor digiti minimi?
To abduct finger 5.
What is the action of the opponens digit minimi?
To oppose finger 5.
What is the action of the lumbricals? (2)
- Flexes 2nd-5th MP joints. 2. Extends 2nd-5th PIP and DIP joints.
What is the action of the dorsal interossei?
To abduct finger 2-5.
What is the action of the palmar interossei?
To adduct finger 2-5.
What is the action of the adductor pollicis?
To adduct the thumb.
The median nerve innervates all flexors but which two?
- Flexor carpi ulnaris. 2. Medial portion of flexor digitorum profundus.
What innervates the supinator?
The radial nerve.
What innervates the abductor pollicis longus?
The radial nerve.
What muscles comprise the thenar group of the intrinsic muscles of the hand? (3)
- Flexor pollicis brevis. 2. Abductor pollicis brevis. 3. Opponens pollicis.
What innervates the thenar group of intrinsic muscles of the hand?
The median nerve.
What three muscles comprise the hypothenar group of intrinsic muscles of the hand?
- Flexor digiti minimi. 2. Abductor digiti minimi. 3. Opponens digiti minimi.
What innervates the hypothenar and midpalmar group of intrinsic muscles of the hand?
The ulnar nerve.
What innervates the lateral and medial lumbricals?
Lateral 2: Ulnar. Medial 2: Ulnar nerve.
Where does the flexor carpi radialis originate and insert?
- Originates on the medial epicondyle. 2. Inserts on the base of the 2nd and 3rd metacarpals.
Where does the flexor carpi ulnaris originate and insert?
- Originates on the medial epicondyle. 2. Inserts on the medial carpal and and metacarpal bones.
Where does the pronator quadratus originate and insert?
- Originates on the distal ulna. 2. Inserts on the distal radius.
What are the three primary elbow flexors?
- Brachii. 2. Brachioradialis. 3. Brachialis.
What are the two primary forearm pronators?
- Pronator teres. 2. Pronator quadratus.
What artery supplies blood to the anterior muscles of the forearm?
Ulnar artery.
What artery supplies blood to the extensor digiti minimi and extensor digitorum?
The posterior interosseous artery.
What artery supplies blood to the brachioradialis?
The radial (Recurrent) artery.
What artery supplies blood to the extensor carpi radialis longus and brevis?
The radial artery.
What artery supplies the supinator?
The radial (reccurent) artery.
What artery supplies the extensor indicis, abductor pollicis longus, extensor pollicis brevis, and extensor pollicis longus?
The posterior interosseous artery.
What artery supplies the flexor pollicis longus, pronator quadratus, and flexor digitorum profundus?
The anterior interosseous artery.
What artery supplies the thenar group?
Superficial palmar arch.
What artery supplies the hypothenar group?
Ulnar artery.
What artery supplies the midpalmar group?
Superficial palmar arch.
