Forearm and Hand Muscles - Hand Flashcards
(120 cards)
1
Q
brachioradialis origin
A
Proximal 2/3 of supracondylar ridge of humerus
2
Q
brachioradialis insertion
A
lateral surface of distal end of radius proximal to styloid process
3
Q
brachioradialis action
A
Weak flexion of forearm; maximal when forearm is mid pronation
4
Q
brachioradialis innervation
A
Radial nerve (C5,C6,C7)
5
Q
extensor carpi radialis longus origin
A
Lateral supraepicondylar ridge of humerus
6
Q
extensor carpi radialis longus insertion
A
Dorsal aspect of base of 2nd metacarpal
7
Q
extensor carpi radialis longus action
A
Extend and abduct hand at the wrist joint; active during fist clenching
8
Q
extensor carpi radialis longus innervation
A
Radial Nerve (C6,C7)
9
Q
extensor carpi radialis brevis origin
A
Lateral epicondyle of humerus (common extensor origin)
10
Q
extensor carpi radialis brevis insertion
A
Dorsal aspect of base of 3rd metacarpal
11
Q
extensor carpi radialis brevis action
A
Extend and abduct hand at the wrist joint; active during fist clenching
12
Q
extensor carpi radialis brevis innervation
A
Deep branch of radial nerve (C7,C8)
13
Q
extensor digitorum origin
A
Lateral epicondyle of humerus (common extensor origin)
14
Q
extensor digitorum insertion
A
Extensor expansions of medial four digits
15
Q
extensor digitorum action
A
Extends medial four digits primarily at MCP joint, secondarily at IP joints
16
Q
extensor digitorum innervation
A
Deep branch of radial nerve (C7,C8)
17
Q
extensor digiti minimi origin
A
Lateral epicondyle of humerus (common extensor origin)
18
Q
extensor digiti minimi insertion
A
Extensor expansion of 5th digit
19
Q
extensor digiti minimi action
A
Extends 5th digit primarily at MCP joint, secondarily at IP joint
20
Q
extensor digiti minimi innervation
A
Deep branch of radial nerve (C7,C8)
21
Q
extensor carpi ulnaris origin
A
Lateral epicondyle of humerus: posterior border of ulna
22
Q
extensor carpi ulnaris insertion
A
Dorsal aspect of base of 5th metacarpal
23
Q
extensor carpi ulnaris action
A
Extends and adducts hand at wrist joint (Also active during fist clenching)
24
Q
extensor carpi ulnaris innervation
A
Deep branch of radial nerve (C7,C8)
25
supinator origin
Lateral epicondyle of humerus; radial collateral and anular ligaments; supinator fossa; crest of ulna
26
supinator insertion
Lateral, posterior, and anterior surfaces of proximal third of radius
27
supinator action
Supinates forearm
28
supinator innervation
Deep branch of radial nerve (C7,C8)
29
abductor pollicis longus origin
Posterior surface of proximal halves of ulna, radius, and interosseus membrane
30
abductor pollicis longus insertion
Base of 1st metacarpal
31
abductor pollicis longus action
Abducts thumb and extends it at CMC joint
32
abductor pollicis longus innervation
Posterior interosseus nerve (C7,C8) as a continuation of deep branch of radial nerve
33
extensor pollicis brevis origin
Posterior surface of distal third of radius and interosseous membrane
34
extensor pollicis brevis insertion
Dorsal aspect of base of proximal phalanx of thumb
35
extensor pollicis brevis action
Extends proximal phalanx of thumb at MCP joint; extends CMC joint
36
extensor pollicis brevis innervation
Posterior interosseous nerve (C7,C8) as a continuation of deep branch of radial nerve
37
extensor pollicis longus origin
Posterior surface of middle third of ulna and interosseous membrane
38
extensor pollicis longus insertion
Dorsal aspect of base of distal phalanx of thumb
39
extensor pollicis longus action
Extends distal phalanx of thumb at IP joint; extends MCP and CMC joints
40
extensor pollicis longus innervation
Posterior interosseous nerve (C7,C8) as a continuation of deep branch of radial nerve
41
extensor indicis origin
Posterior surface of lateral third of ulna and interosseous membrane
42
extensor indicis insertion
Extensor expansion of 2nd digit
43
extensor indicis action
Extends 2nd digit; helps extend hand at wrist
44
extensor indicis innervation
Posterior interosseous nerve (C7,C8) as a continuation of deep branch of radial nerve
45
pronator teres origin
Ulnar Head: coronoid process
| Humeral head: medial epicondyle (Common flexor origin)
46
pronator teres insertion
Middle convexity of lateral surface of radius
47
pronator teres action
Pronates and flexes forearm at elbow
48
pronator teres innervation
Median nerve (C6,C7,C8)
49
flexor carpi radialis origin
Medial epicondyle of humerus (Common flexor origin)
50
flexor carpi radialis insertion
Base of 2nd metacarpal
51
flexor carpi radialis action
Flexes and abducts hand at wrist
52
flexor carpi radialis innervation
Median nerve (C6,C7,C8)
53
Palmaris longus origin
Medial epicondyle of humerus (Common flexor origin)
54
Palmaris longus insertion
Distal half of flexor retinaculum and apex of palmar aponeurosis
55
Palmaris longus action
Flexes hand at wrist and tenses palmar aponeurosis
56
Palmaris longus innervation
median nerve (C6,C7)
57
flexor carpi ulnaris origin
humeral head: Medial epicondyle of humerus (Common flexor origin)
Ulnar head: olecranon and posterior border
58
flexor carpi ulnaris insertion
Pisiform, hook of hamate, 5th metacarpal
59
flexor carpi ulnaris action
Flexes and adducts hand at wrist
60
flexor carpi ulnaris innervation
Ulnar nerve (C7,C8)
61
flexor digitorum superficialis origin
Medial epicondyle, coronoid process, radius distal to radial tuberosity
62
flexor digitorum superficialis insertion
Shafts of middle phalanges of medial four digits
63
flexor digitorum superficialis action
Flexes middle phalanges at proximal IP joints of middle four digits; acting more strongly, it flexes proximal phalanges at MCP joints
64
flexor digitorum superficialis innervation
Median Nerve (C7,C8,T1)
65
flexor digitorum profundus origin
Proximal three quarters of medial and anterior surfaces of ulna and interosseous membrane
66
flexor digitorum profundus insertion
Bases of distal phalanges 2-5
67
flexor digitorum profundus action
Flexes distal phalanges 2-5 at distal IP joints
68
flexor digitorum profundus innervation
Digits 2,3 via Anterior interosseous nerve (C8,T1) and digits 4,5 via ulnar nerve (C8,T1)
69
flexor pollicis longus origin
Anterior surface of radius and adjacent interosseous membrane
70
flexor pollicis longus insertion
Base of distal phalanx of thumb
71
flexor pollicis longus action
Flexes phalanges of 1st digit
72
flexor pollicis longus innervation
Anterior interosseous nerve from median nerve (C8,T1)
73
pronator quadratus origin
Distal quarter of anterior surface of ulna
74
pronator quadratus insertion
Distal quarter of anterior surface of radius
75
pronator quadratus action
Pronates forearm; deep fibers bind radius and ulna together
76
pronator quadratus innervation
Anterior interosseous nerve, from median nerve (C8,T1)
77
abductor pollicis brevis origin
Flexor retinaculum and tubercles of scaphoid and trapezium
78
abductor pollicis brevis insertion
Lateral side of base of proximal phalanx of thumb
79
abductor pollicis brevis action
Abducts thumb; helps with opposition
80
abductor pollicis brevis innervation
Recurrent branch of median nerve (C8,T1)
81
flexor pollicis brevis origin
Flexor retinaculum and tubercles of scaphoid and trapezium
82
flexor pollicis brevis insertion
Lateral side of base of proximal phalanx of thumb
83
flexor pollicis brevis action
Flexes thumb, adducts thumb toward lateral border of palm
84
flexor pollicis brevis innervation
Reccurent branch of median nerve (C8,T1) Deep branch of ulnar nerve (C8,T1)
85
opponens pollicis origin
Flexor retinaculum and tubercles of scaphoid and trapezium
86
opponens pollicis insertion
Lateral side of 1st metacarpal
87
opponens pollicis action
Oppose thumb
88
opponens pollicis innervation
Recurrant branch of median nerve (C8, T1)
89
adductor pollicis origin
Bases of 2nd and 3rd metacarpals, capitate, and adjacent carpals; anterior surface of shaft of 3rd metacarpal
90
adductor pollicis insertion
Medial side of base of proximal phalanx of thumb
91
adductor pollicis action
Adducts thumb toward lateral border of palms
92
adductor pollicis innervation
Deep branch of ulnar nerve (C8,T1)
93
palmaris brevis origin
Flexor retinaculum and palmar aponeurosis
94
palmaris brevis insertion
Skin of palm
95
palmaris brevis action
Steadies and corrugates skin of palm to help with grip
96
palmaris brevis innervation
Superficial branch of ulnar nerve (C8,T1)
97
abductor digiti minimi origin
Pisiform
98
abductor digiti minimi insertion
Medial side of base of proximal phalanx of 5th digit
99
abductor digiti minimi action
Abducts 5th digit; assists in flexion of its proximal phalanx
100
abductor digiti minimi innervation
Deep branch of ulnar nerve
101
flexor digiti minimi origin
Hook of hamate and flexor retinaculum
102
flexor digiti minimi insertion
Medial side of base of proximal phalanx of 5th digit
103
flexor digiti minimi action
Flexes proximal phalanx of 5th digit
104
flexor digiti minimi innervation
Deep branch of ulnar nerve (C8,T1)
105
opponens digiti minimi origin
Hook of hamate and flexor retinaculum
106
opponens digiti minimi insertion
Medial border of 5th metacarpal
107
opponens digiti minimi action
Draws 5th metacarpal into opposition with the thumb
108
opponens digiti minimi innervation
Deep branch of ulnar nerve (C8,T1)
109
lumbricals origin
Tendons of flexor digitorum profundus
110
lumbricals insertion
Lateral sides of extensor expansions of 2-5 digits
111
lumbricals action
Flex MCP joints and extend IP joints of 2-5th digits
112
lumbricals innervation
1st and 2nd via median nerve
| 3rd and 4th via deep branch of ulnar nerve
113
palmar interossei origin
Palmar surfaces of 2nd, 4th, and 5th metacarpals
114
palmar interossei insertion
Bases of proximal phalanges; extensor expansions of 2nd, 4th, and 5th digits
115
palmar interossei action
Adducts digits towards axial line; flexes MCP joints and extends IP joints; 2nd, 4th, and 5th digits
116
palmar interossei innervation
Deep branch of ulnar nerve (C8,T1)
117
dorsal interossei origin
Adjacent sides of two metacarpals
118
dorsal interossei insertion
Bases of proximal phalanges; extensor expansion of 2-4 digits
119
dorsal interossei action
Abducts digits 2-4 from axial line; flex MCP and extend IP
120
dorsal interossei innervation
Deep branch of ulnar nerve (C8,T1)
