Anatomy - Wrist And Hand

Question 1

Name the 8 carpal bones of the wrist.

Answer 1

Proximal, lateral > medial: scaphoid, lunate, triquetrum, pisiform

Distal, lateral > medial: trapezium, trapezoid, capitate, hamate

Question 2

How many phalanges are in the hand?

Answer 2

14 (3 on each digit and 2 on thumb)

Question 3

Describe pronator teres.

Answer 3

Origin: ulnar head - coronoid process; humeral head - medial epicondyle of humerus
Insertion: laterally to mid shaft of radius
Innervation: median nerve
Movements: pronation and flexion of forearm

Question 4

Describe flexor carpi radialis.

Answer 4

Origin: medial epicondyle of humerus
Insertion: base of metacarpals 2 and 3
Innervation: median nerve
Movements: flexion (and abduction?) of wrist joint

Question 5

Describe palmaris longus.

Answer 5

*not present in everyone*
Origin: medial epicondyle of humerus
Insertion: flexor retinaculum of wrist
Innervation: median nerve
Movements: flexion at wrist

Question 6

Describe flexor carpi ulnaris.

Answer 6

Origin: humeral head - medial epicondyle; ulnar head - olecranon
Insertion: pisiform, hamate and base of 5th metacarpal
Innervation: ulnar nerve
Movements: flexion and adduction at wrist

Question 7

Describe flexor digitorum superficialis.

Answer 7

Origin: medial epicondyle and radius
Insertion: base of middle phalanx of digits 2-5
Innervation: median nerve
Movements: flexion of MP joints and proximal IP joints (2-5), flexion at the wrist

Question 8

Describe brachioradialis.

Answer 8

Origin: proximal aspect of lateral supracondylar ridge of humerus
Insertion: distal end of radius, before styloid process
Innervation: radial nerve
Movements: flexion at elbow

Question 9

Describe flexor pollicis longus.

Answer 9

Origin: anterior surface of radius and overlaps onto interosseous membrane
Insertion: base of thumb
Innervation: anterior interosseous branch of median nerve
Movements: flexes the IP and MP joint of the thumb

Question 10

Describe flexor digitorum profundus.

Answer 10

Origin: ulna and interosseous membrane
Insertion: distal phalanges of 2-5
Innervation: 4,5 - ulnar nerve; 2,3 anterior interosseous branch of median nerve
Movements: flexion of distal IP joints of fingers, flexion of MP joints and wrist

Question 11

Describe pronator quadratus.

Answer 11

Origin: anterior surface of ulna
Insertion: anterior surface of radius
Innervation: anterior interosseous branch of median nerve
Movements: pronation