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Gross Anatomy I > Forearm Muscles > Flashcards

Forearm Muscles Flashcards

(77 cards)

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1
Q

pronator teres proximal attachment

A

ulnar head- coronoid process

humeral head- medial epicondyle, common flexor origin

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2
Q

pronator teres distal attachment

A

middle of convexity of lateral surface of radius

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3
Q

pronator teres innervation

A

Median nerve (C6, C7)

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4
Q

pronator teres muscle action

A

pronates and flexes forearm at elbow

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5
Q

flexor carpi radialis (FCR) proximal attachment

A

medial epicondyle, common flexor origin

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6
Q

flexor carpi radialis (FCR) distal attachment

A

base of 2nd metacarpal

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7
Q

FCR innervation

A

Median nerve (C6, C7)

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8
Q

FCR muscle action

A

flexes and abducts wrist

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9
Q

palmaris longus proximal attachment

A

medial epicondyle, common flexor origin

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10
Q

palmaris longus distal attachment

A

distal half of flexor retinaculum, apex of palmar aponeurosis

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11
Q

palmaris longus innervation

A

median nerve (C7, C8)

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12
Q

palmaris longus muscle action

A

flexes hand (at wrist) and tenses palmar aponeurosis

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13
Q

flexor carpi ulnaris (FCU) proximal attachment

A

humeral head: medial epicondyle, common flexor origin

ulnar head: olecranon and posterior border of ulna via aponeurosis

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14
Q

FCU distal attachment

A

pisiform, hook of hamate, 5th metacarpal

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15
Q

FCU innervation

A

ulnar nerve (C7, C8)

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16
Q

FCU muscle action

A

flexes and adducts hand at wrist

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17
Q

Flexor digitorum superficialis proximal attachment

A

humero-ulnar head: medial epicondyle, common flexor origin AND coronoid process

radial head: superior half of anterior border of radius

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18
Q

FDS distal attachment

A

shafts of middle phalanges of medial four digits

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19
Q

FDS innervation

A

median nerve (C7, C8, T1)

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20
Q

FDS muscle action

A

flexes middle phalanges at proximal interphalangeal joints, also flexes proximal phalanges at metacarpophalangeal joints

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21
Q

Flexor digitorum profundus (FDP) proximal attachment

A

medial and lateral parts: proximal 3/4 of medial and anterior surface of ulna and interosseous membrane

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22
Q

FDP distal attachment

A

medial part: bases of distal phalanges of 4th and 5th digits

lateral part: bases of distal phalanges of 2nd and 3rd digits

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23
Q

FDP medial part innervation

A

ulnar nerve (C8, T1)

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24
Q

FDP muscle action

A

medial part: flexes distal phalanges 4 and 5 at distal interphalangeal joints

lateral part: flexes distal phalanges 2 and 3 at distal interphalangeal joints

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25
Flexor pollicis longus (FPL) proximal attachment
anterior surface of radius and adjacent interosseous membrane
26
FPL distal attachment
base of distal phalanx of thumb
27
FPL innervation
anterior interosseous nerve, from median nerve (C8, T1)
28
FPL muscle action
flexes phalanges of thumb
29
Pronator quadratus proximal attachment
distal 1/4 of anterior surface of ulna
30
pronator quadratus distal attachment
distal 1/4 of anterior surface of radius
31
pronator quadratus innervation
anterior interosseous nerve from median nerve (C8, T1)
32
pronator quadratus muscle action
pronates forearm, deep fibers bind radius and ulna together
33
FDP lateral part innervation
anterior interosseous nerve from median nerve (C8, T1)
34
brachioradialis proximal attachment
proximal 2/3 of supra-epicondylar ridge of humerus
35
brachioradialis distal attachment
lateral surface of distal end of radius proximal to styloid process
36
brachioradialis innervation
radial nerve (C5, C6, C7)
37
brachioradialis muscle action
relatively weak flexion of forearm; strongest when forearm is in midpronated position
38
extensor carpi radialis longus (ECRL) proximal attachment
lateral supra-epicondylar ridge of humerus
39
ECRL distal attachment
dorsal aspect of base of 2nd metacarpal
40
ECRL innervation
radial nerve (C6, C7)
41
Extensor carpi radialis brevis (ECRB) proximal attachment
lateral epicondyle; common extensor origin
42
ECRB distal attachment
dorsal aspect of base of 3rd metacarpal
43
ECRB innervation
deep branch of radial nerve (C7, C8)
44
ECRB muscle action
extend and abduct hand at wrist joint
45
Extensor digitorum proximal attachment
lateral epicondyle, common extensor origin
46
extensor digitorum distal attachment
extensor expansions of medial 4 digits
47
extensor digitorum innervation
deep branch of radial nerve (C7, C8)
48
extensor digitorum muscle action
extends medial four digits at metacarpophalangeal joints, secondarily at interphalangeal joints
49
extensor digiti minimi (EDM) proximal attachment
lateral epicondyle, common extensor origin
50
EDM distal attachment
extensor expansion of 5th digit
51
EDM innervation
deep branch of radial nerve (C7, C8)
52
EDM muscle action
extends 5th digit primarily at metacarpophalangeal joint, secondarily at interphalangeal joint
53
ECRL muscle action
extend and abduct hand at wrist joint; active during fist clenching
54
Extensor carpi ulnaris (ECU) proximal attachment
lateral epicondyle of humerus; posterior border of ulna via shared aponeurosis
55
ECU distal attachment
dorsal aspect of base of 5th metacarpal
56
ECU innervation
deep branch of radial nerve (C7, C8)
57
ECU muscle action
extends and adducts hand at wrist joint (also active during fist clenching)
58
supinator proximal attachment
lateral epicondyle of humerus; radial collateral and anular ligaments; supinator fossa, crest of ulna
59
supinator distal attachment
lateral, posterior, and anterior surfaces of proximal 1/3rd of radius
60
supinator innervation
deep branch of radial nerve (C7, C8)
61
supinator muscle action
supinates forearm; rotates radius to turn palm anteriorly or superiorly (if elbow is fixed)
62
extensor indicis (EI) proximal attachment
posterior surface of distal third of ulna and interosseous membrane
63
Extensor indicis muscle action
extends 2nd digit (enabling independent extension), helps extend hand at wrist
64
Abductor pollicis longus (APL) proximal attachment
posterior surface of proximal halves of ulna, radius, and interosseous membrane
65
APL distal attachment
base of 1st metacarpal
66
APL innervation
posterior interosseous nerve, continuation of deep branch of radial nerve (C7, C8)
67
APL muscle action
abducts thumb and extends it at carpometacarpal joint
68
Extensor pollicis longus (EPL) proximal attachment
posterior surface of middle third of ulna and interosseous membrane
69
EPL distal attachment
dorsal aspect of base of distal phalanx of thumb
70
EPL innervation
posterior interosseous nerve, continuation from deep branch of radial nerve, (C7, C8)
71
EPL muscle action
extends distal phalanx of thumb at interphalangeal joint, extends metacarpophalangeal and carpometacarpal joints
72
Extensor pollicis brevis (EPB) proximal attachment
posterior surface of distal 1/3rd of radius and interosseous membrane
73
EPB distal attachment
dorsal aspect of base of proximal phalanx of thumb
74
EPB innervation
posterior interosseous nerve, continuation of deep branch of radial nerve, (C7, C8)
75
EPB muscle action
extends proximal phalanx of thumb at metacarpophalangeal joint, extends carpometacarpal joint
76
Extensor Indicis distal attachment
extensor expansion of 2nd digit
77
extensor indicis innervation
posterior interosseous nerve, continuation of deep branch of radial nerve (C7, C8)

Gross Anatomy I (4 decks)

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