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CLINICAL ANATOMY- UPPER EXTREMITY > Muscles of the Forearm > Flashcards

Muscles of the Forearm Flashcards

1
Q

Abductor pollicis longus innervation

A

radial nerve

Posterior compartment, deep
(C6-8)

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2
Q

Attachments of the abductor pollicis longus

A

from proximal posterior radius, ulna and interosseous membrane to the base of the 1st metacarpal & trapezium

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3
Q

Actions of the abductor pollicis longus

A

abducts and extends the thumb at the carpometacarpal joint and abducts hand at wrist (radial deviation)

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4
Q

Innervation of the brachioradialis

A

radial nerve

(C5-6)

(posterior compartment- superficial layer)

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5
Q

What is the only non-extensor muscle in the posterior compartment of the forearm (superficial layer)?

A

brachioradialis

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6
Q

Attachments of the brachioradialis

A

From the lateral supracondylar ridge of the humerus –> distal radius lateral to the styloid process

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7
Q

Actions of the brachioradialis

A

elbow flexion

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8
Q

extensor carpi radialis brevis (ECRB) INNERVATION

A

radial nerve (C6-8)

posterior compartment, superficial layer

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9
Q

Attachments of the extensor carpi radialis brevis

A

lateral epicondyle of the humerus (common extensor origin) –> base of the the 3rd metacarpal

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10
Q

Actions of the ECRB

A

Extends and abducts the hand at the wrist (radial deviation)

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11
Q

extensor carpi radialis longus innervation

A

radial nerve

C6-8

(posterior compartment of forearm, superficial layer)

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12
Q

Attachments of the extensor carpi radialis longus

A

lateral supracondylar ridge of the humerus–> base of the 2nd metacarpal

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13
Q

Actions of the extensor carpi radialis longus

A

extension and abduction of the hand at wrist (radial deviation) and assist in flexion of the elbow

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14
Q

Innervation of the extensor carpi ulnaris

A

radial nerve

(posterior compartment of the forearm, superficial layer)

C6-8

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15
Q

Attachments of the extensor carpi ulnaris

A

lateral epicondyle of the humerus (common extensor origin) to the base of the 5th metacarpal

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16
Q

Actions of the extensor carpi ulnaris

A

extends and adducts the hand at the wrist (ulnar deviation)

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16
Q

Actions of the extensor carpi ulnaris

A

extends and adducts the hand at the wrist (ulnar deviation)

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17
Q

Innervation of the extensor digitorum

A

Radial nerve (C6-8)

posterior compartment of forearm, superficial layer

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18
Q

Attachments of the extensor digitorum

A

lateral epicondyle of the humerus (common extensor origin) to the extensor expansions of digits 2-5

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18
Q

Actions of the extensor digitorum

A

extends phalanges (primarily at MCP, secondarily at interphalangeal) and extends hand at wrist

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19
Q

Innervation of the extensor digiti minimi

A

radial nerve (C7-8)

Posterior comartment, superficial

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20
Q

Attachments of the extensor digiti minimi

A

Lateral epicondyle of the humerus (common extensor origin) to the digital expansion of 5th digit

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21
Q

Actions of the extensor digiti minimi

A

extends 5th digit (MCP and IP joints)

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22
Q

Innervation of extensor indicis

A

radial nerve (C7-8)

DEEP layer of posterior compartment

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23
Q

Attachments of the extensor indicis

A

from the posterior surface of the ulna and interosseous membrane –> the digital expansion of the 2nd digit

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24
Q

Actions of the extensor indicis

A

extends 2nd digit (MCP & IP)

25
Q

Innervation of the extensor pollicis brevis

A

radial nerve (C6-8)

posterior compartment, deep layer to the thumb

26
Q

Attachments of the extensor pollicis brevis

A

posterior radial surface and interosseous membrane –> the base of the 1st proximal phalanx

27
Q

Actions of the extensor pollicis brevis

A

extends the thumb at MCP and extends and abducts CMC joint

28
Q

Innervation of the extensor pollicis longus

A

radial nerve

(C6-8)

(posterior compartment, deep muscles to the thumb)

29
Q

Attachments of the extensor pollicis longus

A

middle 1/3rd of the posterior surface of the ulna and interosseous membrane –> the base of the 1st distal phalanx

30
Q

Actions of the extensor pollicis longus

A

extends the thumb (CMC, MCP, and IP)

31
Q

Innervation of the flexor carpi radialis

A

median nerve

(C6-8)

(anterior compartment, superficial)

32
Q

Attachments of the flexor carpi radialis

A

the medial epicondyle (common flexor origin) to the palmar aspect of the base of the 2nd metacarpal

33
Q

Actions of the flexor carpi radialis

A

flexes & abducts hand at wrist (radial deviation) and

may assist in pronation of forearm & flexion of the elbow

34
Q

Innervation of the flexor carpi ulnaris

A

ulnar nerve (C7-T1)

anterior compartment, superficial

35
Q

Attachments of the flexor carpi ulnaris

A

from the medial epicondyle (common flexor origin) of the humerus and proximal ulnar shaft to the pisiform (medial carpal bone)

36
Q

Actions of the flexor carpi ulnaris

A

flexes & adducts hand at wrist (ulnar deviation) and

assists in flexion of the elbow

37
Q

Innervation of the palmaris longus

A

median nerve

(C7-8)

(ant compartment, superficial)

38
Q

Attachments of the palmaris longus

A

medial epicondyle of the humerus (common flexor origin) to palmar aponeurosis

39
Q

Actions of palmaris longus

A

flexes hand at wrist

tenses palmar fascia

40
Q

Innervation of pronator teres

A

Median nerve (C6-7)

ant compartment, superficial

41
Q

Attachments of the pronator teres

A

from the medial epicondyle and ulnar coronoid process (2 heads to this muscle) to lateral aspect of the radius

42
Q

Actions of the pronator teres

A

pronates forearm

flexes forearm

43
Q

Innervation of flexor digitorum superficialis

A

median nerve (C7-T1)

ant compartment, intermediate layer

44
Q

Attachments of the flexor digitorum superficialis

A

from the medial epicondyle (common flexor origin) of the humerus –> the bodies (sides) of the middle phalanges of digits 2-5

45
Q

Actions of flexor digitorum superficialis

A

flexion of digits (MCP & PIP),

flexion of hand at wrist

46
Q

Innervation of flexor digitorum profundus

A

median (anterior interosseous nerve; 2nd & 3rd digits)

ulnar (4th & 5th digits) nerves (ULNAR NERVE TO FDP and FCU in anterior compartment)

(C7-T1)

(ant compartment, deep)

47
Q

Attachments of the flexor digitorum profundus

A

from the anterior proximal two thirds of the ulna and interosseous membrane to the base of the distal phalanges of digits 2-5

48
Q

Actions of flexor digitorum profundus

A

flexion of digits 2-5 (MCP, DIP, PIP) and flexion of hand at wrist

49
Q

Innervation of the flexor pollicis longus

A

median nerve (anterior interosseous nerve)

C7-T1

(anterior compartment, deep)

50
Q

What 3 muscles are innervated by the anterior interosseous nerve (from the median nerve)

A

flexor pollicis longus, pronator quadratus, flexor digitorum profundus (radial side)

51
Q

Attachments of the flexor pollicis longus

A

from the anterior surface of the radius and interosseous membrane to the base of the distal phalanx of the thumb

52
Q

Actions of the flexor pollicis longus

A

flexes thumb at MCP and IP joints

53
Q

Innervation of the pronator quadratus

A

median nerve (anterior interosseous nerve) (C8-T1)

anterior compartment, deep

54
Q

Attachments of the pronator quadratus

A

from the anterior surface of the distal ulna to the anterior surface of the distal radius

55
Q

Actions of the pronator quadratus

A

pronates the forearm

56
Q

Innervation of the supinator

A

radial nerve (C5-6)

posterior compartment, deep

57
Q

Attachments of the supinator

A

from the lateral epicondyle of the humerus, radial collateral ligament and supinator crest of the ulna –> the lateral surface of the proximal radius

58
Q

Actions of the supinator

A

supinates the forearm

59
Q

What 4 extensor muscles do not attach at the lateral epicondyle (common extensor origin)?

A

extensor carpi radialis longus - lateral supracondylar ridge of the humerus

extensor indicis - from the posterior surface of the ulna & interosseous membrane

extensor pollicis brevis- from the posterior radial surface & interosseous membrane

extensor pollicis longus- from the middle 1/3rd of the posterior surface of the ulna & interosseous membrane

60
Q

Do the extensor pollicis longus and the extensor pollicis brevis have proximal attachments on the same bone?

A

no

longus- ulna
brevis- radius

61
Q

What flexor muscles/anterior forearm muscles do not attach at the medial epicondyle of the humerus?

A

flexor digitorum profundus- anterior proximal 2/3 of the ulna and interosseous membrane

flexor pollicis longus-

pronator quadratus

62
Q

What muscle is not a forearm extensor but still attaches at the lateral epicondyle of the humerus?

A

the supinator

CLINICAL ANATOMY- UPPER EXTREMITY (17 decks)

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