lab 4- hand and wrist

Question 1

Answer 1

flexor carpi radialis
Origin:
Medial epicondyle of humerus
Insertion:
Bases of metacarpal bones 2-3
Action:
Wrist joint: Wrist flexion, wrist abduction
Innervation:
Median nerve (C6, C7)

Question 2

Answer 2

flexor carpi ulnaris
Origin:
Medial epicondyle of humerus, olecranon and posterior border of ulna
Insertion:
Pisiform bone, hamate bone, base of metacarpal bone 5
Action:
Wrist joint: Wrist flexion, wrist adduction
Innervation:
Ulnar nerve (C7-T1)

Question 3

Answer 3

palmaris longus
Origin:
Medial epicondyle of humerus
Insertion:
Flexor retinaculum, palmar aponeurosis
Action:
Wrist joint: Wrist flexion;
Tenses palmar aponeurosis
Innervation:
Median nerve (C7, C8)

Question 4

Answer 4

externsor carpi radialis longus
Origin:
Lateral supracondylar ridge of humerus, lateral intermuscular septum of arm
Insertion:
Posterior aspect of base of metacarpal bone 2
Actions:
Wrist joints: Hand extension, hand abduction (radial deviation)
Innervation:
Radial nerve (C5-C8)

Question 5

Answer 5

externsor carpi radialis brevius
Origin:
Lateral epicondyle of humerus (common extensor tendon)
Insertion:
Posterior aspect of base of metacarpal bone 3
Action:
Wrist joints: Hand extension, hand abduction (radial deviation)
Innervation:
Radial nerve (C5- C6)

Question 6

Answer 6

extensor carpi ulnairs
Origin:
Lateral epicondyle of humerus, posterior border of ulna
Insertion:
Base of metacarpal bone 5
Action:
Wrist joint: Hand extension and adduction
Innervation:
Posterior interosseous nerve (C7, C8)

Question 7

Answer 7

Question 8

Answer 8

pronator teres
Origin:
Humeral head: medial supracondylar ridge of humerus
Ulnar head: Coronoid process of ulna
Insertion:
Lateral surface of radius (distal to supinator)
Action:
Pronation of forearm at the proximal radioulnar joint, flexion of the forearm at the elbow joint
Innervation:
Median nerve (C6, C7)

Question 9

Answer 9

flexor digitorum superficialis
Origin:
Humeroulnar head: Medial epicondyle of humerus, coronoid process of ulna
Radial head: Proximal half of anterior border of radius
Insertion:
Sides of middle phalanges of digits 2-5
Action:
Metacarpophalangeal and proximal interphalangeal joints 2-5: Finger flexion
Innervation:
Median nerve (C8, T1)

Question 10

Answer 10

flexor digitorum profundus
Origin:
Proximal half of anterior surface of ulna, interosseous membrane
Insertion:
Palmar surfaces of distal phalanges of digits 2-5
Action:
Metacarpophalangeal and interphalangeal joints 2-5: Finger flexion
Innervation:
Digits 2-3: Median nerve (anterior interosseous nerve);
Digits 4-5: Ulnar nerve (C8, T1)

Question 11

Answer 11

supinator
Origin:
Lateral epicondyle of humerus, radial collateral ligament, annular ligament, supinator crest of ulna
Insertion:
Lateral, posterior, and anterior surfaces of proximal third of radius
Action:
Proximal radioulnar joint: Forearm supination
Innervation:
Posterior interosseous nerve (C7, C8)

Question 12

Answer 12

lumbericals
Origins:
Tendons of flexor digitorum profundus muscle
Insertions:
Extensor expansion of hand
Innervation:
Lumbricals 1-2: Median nerve (C8-T1)
Lumbricals 3-4: Ulnar nerve (C8-T1)
Mnemonic: ‘1 2 me, 3 4 u’ (One to me, three for you)
Function:
Metacarpophalangeal joints 2-5: Finger flexion
Interphalangeal joints 2-5: Finger extension

Question 14

Answer 14

dorsal interossei
Origins
Adjacent sides of metacarpal bones 1-5
Insertions
1 & 2: Radial bases of proximal
phalanges/extensor
expansions of digits 2 & 3
3 & 4: Ulnar bases of proximal
phalanges/extensor
expansions of digits 3 and 4
Function
Metacarpophalangeal joints 2-4: Finger abduction, finger flexion;
Interphalangeal joints 2-4: Finger extension
Innervation
Deep branch of ulnar nerve (C8-Th1)

Answer 15

palmar interossi
Origin
Ulnar side of metacarpal bone 2, Radial side of metacarpal bones 4 and 5
Insertion
1: Ulnar base of proximal phalanx/extensor expansion of digit 2
2 & 3: Radial base of proximal phalanges/extensor expansions of digits 4 and 5
Action
Metacarpophalangeal joints 2,4 & 5: Finger adduction, Finger flexion;
Interphalangeal joints 2,4 & 5: Finger extension
Mnemonic: PAD DAB (‘Use your hand to dab with a pad’) - Palmar interossei ADduct, Dorsal interossei ABduct
Innervation
Deep branch of ulnar nerve (C8-T1)