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Functional Anatomy > Forearm Muscles > Flashcards

Forearm Muscles Flashcards

0
Q

Origin and insertion of Pronator Teres

Two heads

A

O- medial head- coronoid process
Humeral head- medial epicondyle
I- middle convex of lateral surface of radius (distal to supinator insertion)

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1
Q

Name the flexor/pronation muscles

  • superficial
  • intermediate
  • deep
A

Superficial- Pronator Teres, Flexor Carpi Radialis, Palmaris longus, Flexor Carpi ulnaris

Intermediate- Flexor digitorum superficialis

Deep - Flexor digitorum Profundus, Flexor pollicis longus, Pronator Quadratus

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2
Q

Innervation of Pronator Teres

A

Median nerve

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3
Q

Action of Pronator Teres

A

Probated and flexes forearm at elbow

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4
Q

Origin and insertion of Flexor Carpi Radialis

A

O- medial epicondyle of humerus

I- base of 2nd metacarpal

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5
Q

Innervation of FCR

A

Median nerve

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6
Q

Action of FCR

A

Flexes and abducts hand at wrist

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7
Q

Origin and insertion of Palmaris longus

A

O- medial epicondyle of humerus

I- distal half of flexor-retina cultus and apex of palmar aponeurosis

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8
Q

Innervation of Palmaris longus

A

Median nerve

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9
Q

Action of Palmaris longus

A

Flexes hand at wrist and tenses palmar aponeurosis

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10
Q

Origin and insertion of flexor Carpi ulnaris (humeral and ulnar head)

A

O- humeral head- medial epicondyle of humerus
Ulnar head- olecranon and posterior border of ulna
I- pisiform, hook of hamate, 5th metacarpal

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11
Q

Innervation of FCU

A

Ulnar nerve

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12
Q

Action of FCU

A

Flexes and adducts hand at wrist

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13
Q

Origin and insertion of flexor Carpi superficialis

Humeral head and radial head

A

O- humeral head- medical epicondyle and coronoid process
Radial head- superior half of anterior border
I- shafts of middle phalanges (medial digits)

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14
Q

Innervation of FDS

A

Median nerve

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15
Q

Action of FDS

A

Flexes middle phalanges at proximal interphalangeal joints of middle 4 digits; acting more strongly, it also flexes proximal phalanges at metacarpophalangeal joints

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16
Q

Origin and insertion of Flexor Digitorum Profundus

A

O- proximal 3/4 of medial and anterior ulna and interosseous membrane
I- medial part- bases of distal phalanges of 4-5th digits
Lateral part - bases of distal phalanges at 2-3rd digits

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17
Q

Innervation of FDP

Medial and lateral part

A

Lateral part- median nerve

Medial part- ulnar nerve

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18
Q

Action of FDP

A

Flexes distal phalanges of 2-5th distal interphalangeal joints

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19
Q

Origin and insertion of flexor pollicis longus

A

O- anterior surface if radius and interosseous membrane

I- base of distal phalanx of thumb

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20
Q

Innervation of FPL

A

Median nerve

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21
Q

Action of FPL

A

Flexes phalanges of 1st digit

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22
Q

Origin and insertion of Pronator Quadratus

A

O- distal quarter of anterior surface of ulna

I- distal quarter of anterior surface of radius

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23
Q

Numeration of Pronator Quadratus

A

Median nerve

24
Q

Action of Pronator Quadratus

A

Pronator the arm

Deep fibers bind ulna and radius together

25
Q

Name the extensor/supinator muscles

Superficial deep and outcropping

A

Superficial- brachioradialis, extensor Carpi Radialis longus, extensor Carpi Radialis brevis , extensor digitorum, extensor digitiminimi, extensor Carpi ulnaris.

Deep- supinator, extensor indices

Outcropping (deep layer) - abductor pollicis longus, extensor pollicis brevis and extensor pollicis longus, = snuff box

26
Q

Origin and insertion of brachioradialis

A

O- proximal 2/3 of lateral supra-epicondylar ridge

I- lateral surface/distal end of radius-proximal to styloid process

27
Q

Innervation of brachioradialis

A

Radial nerve

28
Q

Action of brachioradialis

A

Relatively weak flexion of forearm (maximal when forearm is in mid probated position)

29
Q

Origin and insertion of extensor Carpi Radialis longus

A

O- lateral supra-epicondylar ridge of humerus

I- dorsal base of 2nd metacarpal

30
Q

Innervation if ECRL

A

Radial nerve

31
Q

Action of ECRL

A

Extends and abducts hand at the wrist joint

Active during fist clenching

32
Q

Origin and insertion of Extensor Carpi Radialis Brevis

A

O- Lateral epicondyle of humerus

I- Dorsal aspect of base of 3rd metacarpal

33
Q

Innervation of ECRB

A

Radial nerve

34
Q

Action of ECRB

A

Extends and abducts hand (works with ECRL)

35
Q

Origin and insertion of extensor digitorum

A

O- lateral epicondyle of humerus

I- Extensor expansions of medial 4 digits

36
Q

Innervation of ED

A

Radial nerve

37
Q

Action of ED

A

Extends medial 4 digits primarily at metacarpophalangeal joints, secondarily at interphalangeal joints

38
Q

Origin and insertion of Extensir Digiti Minimi

A

O- lateral epicondyle of humerus

I- extensor expansions of 5th digit

39
Q

Innervation of EDM

A

Radial nerve

40
Q

Action of EDM

A

Extends 5th digit primarily at metacarpophalangeal joint, secondarily at Interphalangeal joint

41
Q

Origin and insertion of Extensor Carpi ulnaris

A

O- lateral epicondyle of humerus, posterior border of ulna.

I- dorsal aspect of base of 5th metacarpal

42
Q

Innervation of ECU

A

Radial nerve

43
Q

Action of Extensor Carpi Ulnaris

A

Extends and adducts hand at wrist joint

Also active during fist clenching

44
Q

Origin and insertion of Supinator muscle

A

O- lateral epicondyle of humerus, radial collateral and angular ligaments. Crest of ulna
I- lateral, posterior and anterior surface of proximal 3rd of radius

45
Q

Innervation of supinator

A

Radial nerve

46
Q

Action of supinator

A

Supinate forearm

47
Q

Origin and insertion of extensor indices

A

O- posterior surface of distal 3rd of ulna and interosseous membrane
I- Extensor expansion of 2nd digit

48
Q

Innervation of extensor indices

A

Radial nerve

49
Q

Action of extensor indices

A

Extends 2nd digit
Enables independent expansion
Helps extend hand at wrist

50
Q

Origin and insertion of abductor pollicis longus

A

O- posterior surface of proximal halves of ulna radius and interosseous membrane
I- base of 1st metacarpal

51
Q

Innervation of APL

A

Radial nerve

52
Q

Action of APL

A

Abducts thumb and extends it at carpometacarpal joint

53
Q

Origin and insertion of extensor pollicis brevis

A

O- posterior surface of distal 3rd of ulna and interosseous membrane
I- dorsal aspect of base of proximal phalanx of thumb

54
Q

Innervation of EPB

A

Radial nerve

55
Q

Action of EPB

A

Extends proximal phalanxes of thumb at metacarpophalangeal joint, extends carpometacarpal joint

56
Q

Origin and insertion of extensor pollicis longus

A

O- posterior surface of middle 3rd of ulna and interosseous membrane
I- dorsal aspect of base of distal phalanx of thumb

57
Q

Innervation of EPL

A

Radial nerve

58
Q

Action EPL

A

Extends distal phalanx of thumb at interphalangeal , metacarpophalangeal joint; extends carpometacarpal joint

Functional Anatomy (18 decks)

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