Upper Extremity Muscles Week 2 Flashcards
0
Q
Brachioradialis insertion (distal attachment)
A
Lateral surface of distal end of radius proximal to styloid process
1
Q
Brachioradialis origin (proximal attachment)
A
Proximal two thirds of lateral supraepicondylar ridge of humerus
2
Q
Brachioradialis innervation
A
Radial nerve (C5, C6, C7)
3
Q
Brachioradialis action
A
Relatively weak flexion of elbow joint, maximal when forearm is in midpronated position
4
Q
Extensor carpi radialis longus origin (proximal attachment)
A
Lateral supraepicondylar ridge of humerus
5
Q
Extensor carpi radialis longus insertion (distal attachment)
A
Dorsal aspect of base of 2nd metacarpal
6
Q
Extensor carpi radialis longus innervation
A
Radial nerve (C6, C7)
7
Q
Extensor carpi radialis longus action
A
Extend and abduct wrist joint
8
Q
Extensor carpi radialis brevis origin (proximal attachment)
A
Lateral epicondyle of humerus
9
Q
Extensor carpi radialis brevis insertion (distal attachment)
A
Dorsal aspect of base of 3rd metacarpal
10
Q
Extensor carpi radialis brevis innervation
A
Deep branch of radial nerve (C7, C8)
11
Q
Extensor carpi radialis brevis action
A
Extend and abduct wrist joint; active during fist clenching
12
Q
Extensor digitorum origin (proximal attachment)
A
Lateral epicondyle of humerus
13
Q
Extensor digitorum insertion (distal attachment)
A
Extensor expansions of medial four fingers
14
Q
Extensor digitorum innervation
A
Deep branch of radial nerve (C7, C8)
15
Q
Extensor digitorum action
A
Extend wrist joint
Extend medial four fingers primarily at metacarpophalangeal joints, secondarily at interphalangeal joints
16
Q
Extensor digiti minimi origin (proximal attachment)
A
Lateral epicondyle of humerus
17
Q
Extensor digiti minimi insertion (distal attachment)
A
Extensor expansion of 5th finger
18
Q
Extensor digiti minimi innervation
A
Posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve
19
Q
Extensor digiti minimi action
A
Extends wrist joint
Extends 5th finger primarily at metacarpophalangeal joint, secondarily at interphalangeal joint
20
Q
Extensor carpi ulnaris origin (proximal attachment)
A
Lateral epicondyle of humerus, posterior border of ulna via a shared aponeurosis
21
Q
Extensor carpi ulnaris insertion (distal attachment)
A
Dorsal aspect of base of 5th metacarpal
22
Q
Extensor carpi ulnaris innervation
A
Posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve
23
Q
Extensor carpi ulnaris action
A
Extends and adducts wrist joint; active during fist clenching
24
Abductor pollicis longus origin (proximal attachment)
Posterior surface of proximal halves of ulna, radius, and interosseous membrane
25
Abductor pollicis longus insertion (distal attachment)
Base of 1st metacarpal
26
Abductor pollicis longus innervation
Posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve
27
Abductor pollicis longus action
Extends wrist joint, abducts thumb and extends it at carpometacarpal joint
28
Extensor pollicis longus origin (proximal attachment)
Posterior surface of middle third of ulna and interosseous membrane
29
Extensor pollicis longus insertion (distal attachment)
Dorsal aspect of base of distal phalanx of thumb
30
Extensor pollicis longus innervation
Posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve
31
Extensor pollicis longus action
Extends wrist joint, extends distal phalanx of thumb at interphalangeal joint, extends metacarpophalangeal and carpometacarpal joints
32
Extensor pollicis brevis origin (proximal attachment)
Posterior surface of distal third of radius and interosseous membrane
33
Extensor pollicis brevis insertion (distal attachment)
Dorsal aspect of base of proximal phalanx of thumb
34
Extensor pollicis brevis innervation
Posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve
35
Extensor pollicis brevis action
Extends wrist joint, extends proximal phalanx of thumb at metacarpophalangeal joint, extends carpometacarpal joint
36
Extensor indicis origin (proximal attachment)
Posterior surface of distal third of ulna and interosseous membrane
37
Extensor indicis insertion (distal attachment)
Extensor expansion of 2nd finger
38
Extensor indicis innervation
Posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve
39
Extensor indicis action
Extends wrist joint, extends 2nd finger (enabling its independent extensions), helps extend hand at wrist
40
Supinator origin (proximal attachment)
Lateral epicondyle of humerus, radial collateral and annular ligaments, supinator fossa, crest of ulna
41
Supinator insertion (distal attachment)
Lateral, posterior, and anterior surfaces of proximal third of radius
42
Supinator innervation
Deep branch of radial nerve (C7, C8)
43
Supinator action
Supinates forearm
44
Pronator teres origin (proximal attachment)
Ulnar head: coronoid process of ulna
| Humeral head: Medial epicondyle of humerus
45
Pronator teres insertion (distal attachment)
Middle of convexity of lateral surface of radius
46
Pronator teres innervation
Median nerve (C6, C7)
47
Pronator teres action
Pronates and flexes forearm
48
Flexor carpi radialis origin (proximal attachment)
Medial epicondyle of humerus
49
Flexor carpi radialis insertion (distal attachment)
Base of 2nd (3rd) metacarpal
50
Flexor carpi radialis innervation
Median nerve (C6, C7)
51
Flexor carpi radialis action
Flexes and abducts hand at wrist
52
Palmaris longus origin (proximal attachment)
Medial epicondyle of humerus
53
Palmaris longus insertion (distal attachment)
Distal half of flexor retinaculum, palmar aponeurosis
54
Palmaris longus innervation
Median nerve (C7, C8)
55
Palmaris longus action
Flexes hand at wrist and tenses palmar aponeurosis
56
Flexor digitorum superficialis origin (proximal attachment)
Humero-ulnar head: medial epicondyle of humerus and coronoid process of ulna
Radial head: oblique line of radius
57
Flexor digitorum superficialis insertion (distal attachment)
Shafts (bodies) of middle phalanges of medial four digits
58
Flexor digitorum superficialis innervation
Median nerve (C7, C8, T1)
59
Flexor digitorum superficialis actions
Flexes wrist joint
Flexes proximal interphalangeal joints of middle four digits; acting more strongly, it also flexes proximal phalanges at metacarpophalangeal joints
60
Flexor carpi ulnaris origin (proximal head)
Olecranon and posterior border of ulna (via aponeurosis)
61
Flexor carpi ulnaris insertion (distal attachment)
Pisiform, hook of hamate, 5th metacarpal
62
Flexor carpi ulnaris innervation
Ulnar nerve (C7, C8)
63
Flexor carpi ulnaris action
Flexes and adducts hand at wrist
64
Flexor pollicis longus origin (proximal attachment)
Anterior surface of radius and adjacent interosseous membrane
65
Flexor pollicis longus insertion (distal attachment)
Base of distal phalanx of thumb
66
Flexor pollicis longus innervation
Anterior interosseous nerve, from median nerve (C8, T1)
67
Flexor pollicis longus action
Flexes wrist, flexes metacarpophalangeal and interphalangeal joints of thumb
68
Flexor digitorum profundus origin (proximal attachment)
Proximal three quarters of medial and anterior surfaces of ulna and interosseous membrane
69
Flexor digitorum profundus insertion (distal attachment)
Bases of distal phalanges of 2nd-5th digits
70
Flexor digitorum profundus innervation
Lateral part (digits 2 and 3): Median nerve (C8, T1) (anterior interosseous branch)
Medial part (digits 4 and 5): Ulnar nerve (C8, T1)
71
Flexor digitorum profundus action
Flexes wrist joint
| Flexes distal interphalangeal joints of digits 2-5; assists with wrist flexion
72
Pronator quadratus origin (proximal attachment)
Distal quarter of anterior surface of ulna
73
Pronator quadratus insertion (distal attachment)
Distal quarter of anterior surface of radius
74
Pronator quadratus innervation
Anterior interosseous nerve, from median nerve (C8, T1)
75
Pronator quadratus action
Pronates forearm; deep fibers bind radius and ulna together
76
Abductor pollicis brevis origin (proximal attachment)
Flexor retinaculum and tubercles of scaphoid and trapezium
77
Abductor pollicis brevis insertion (distal attachment)
Lateral side of base of proximal phalanx of thumb
78
Abductor pollicis brevis innervation
Recurrent branch of median nerve (C8, T1)
79
Abductor pollicis brevis action
Abducts thumb; helps oppose it
80
Flexor pollicis brevis origin (proximal attachment)
Flexor retinaculum and tubercles of scaphoid and trapezium
81
Flexor pollicis brevis insertion (distal attachment)
Lateral side of base of proximal phalanx of thumb
82
Flexor pollicis brevis innervation
Recurrent branch of median nerve (C8, T1)
83
Flexor pollicis brevis action
Flexes thumb
84
Oppnens pollicis origin (proximal attachment)
Flexor retinaculum and tubercles of scaphoid and trapezium
85
Oppnens pollicis insertion (distal attachment)
Lateral side of 1st metacarpal
86
Oppnens pollicis innervation
Recurrent branch of median nerve (C8, T1)
87
Oppnens pollicis action
To oppose thumb, it draws 1st metacarpal medially to center of palm and rotates it medially
88
Abductor digiti minimi origin (proximal attachment)
Pisiform
89
Abductor digiti minimi insertion (distal attachment)
Medial side of base of proximal phalanx of 5th finger
90
Abductor digiti minimi innervation
Deep branch of ulnar nerve (C8, T1)
91
Abductor digiti minimi action
Abducts 5th finger, assists in flexion of its proximal phalanx
92
Flexor digiti minimi brevis origin (proximal attachment)
Hook of hamate and flexor retinaculum
93
Flexor digiti minimi brevis insertion (distal attachment)
Medial side of base of proximal phalanx of 5th finger
94
Flexor digiti minimi brevis innervation
Deep branch of ulnar nerve (C8, T1)
95
Flexor digiti minimi brevis action
Flexes proximal phalanx of 5th finger
96
Opponens digiti minimi origin (proximal attachment)
Hook of hamate and flexor retinaculum
97
Opponens digiti minimi insertion (distal attachment)
Medial border of 5th metacarpal
98
Opponens digiti minimi innervation
Deep branch of ulnar nerve (C8, T1)
99
Opponens digiti minimi action
Draws 5th metacarpal anterior and rotates it, bringing 5th finger into opposition with thumb
100
Lumbricals origins (proximal attachments)
1 and 2: Lateral two tendons of flexor digitorum profundus (as unipennate muscles)
3 and 4: Medial three tendons of flexor digitorum profundus (as bipennate muscles)
101
Lumbricals insertion (distal attachment)
Lateral sides of extensor expansions of 2nd-5th fingers
102
Lumbricals innervation
1 and 2: Median nerve (C8, T1)
| 3 and 4: Ulnar nerve (C8, T1)
103
Lumbricals action
Flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th fingers
104
Dorsal interossei 1-4 origin (proximal attachment)
Adjacent sides of two metacarpals (as bipennate muscles)
105
Dorsal interossei 1-4 insertion (distal attachment)
Bases of proximal phalanges; extensor expansions of 2nd-4th fingers
106
Dorsal interossei 1-4 innervation
Deep branch of ulnar nerve (C8, T1)
107
Dorsal interossei 1-4 action
Abduct 2nd-4th fingers from axial line; act with lumbricals in flexing metacarpophangeal joints and extending interphalangeal joints
108
Palmar interossei 1-3 origin (proximal attachment)
Palmar surfaces of 2nd, 4th, and 5th metacarpals (as unipennate muscles)
109
Palmar interossei 1-3 insertion (distal attachment)
Bases of proximal phalanges; extensor expansions of 2nd, 4th, and 5th fingers
110
Palmar interossei 1-3 innervation
Deep branch of ulnar nerve (C8, T1)
111
Palmar interossei 1-3 action
Adduct 2nd, 4th, and 5th fingers toward axial line; assists lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints
112
Adductor pollicis origin (proximal attachment)
Oblique head: Bases of 2nd and 3rd metacarpals, capitate, adjacent carpals
Transverse head: Anterior surface of body (shaft) of 3rd metacarpal
113
Adductor pollicis insertion (distal attachment)
Medial side of base of proximal phalanx of thumb
114
Adductor pollicis innervation
Deep branch of ulnar nerve (C8, T1)
115
Adductor pollicis action
Adducts thumb toward lateral border of palm
