Muscles for Practical Flashcards Preview

MSI Module II > Muscles for Practical > Flashcards

Flashcards in Muscles for Practical Deck (46):
1

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Trapezius

Innervation: spinal accesory nerve (CNXI)

Action:

  • Descending part elevates
  • Ascending part depresses
  • Middle part retracts 

2

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Rhomboid Major

Innervation: dorsal scapular nerve

Action: retract scapula, fix scapula to thoracic wall

3

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Rhomboid minor

Innervation: dorsal scapular nerve

Action: retract scapula, fix scapula to thoracic wall

4

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Levator scapulae

Innervation: dorsal scapular nerve

Action: elevate scapula

5

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Deltoid

Innervation: axillary nerve

Action: 

  • Anterior part flexes arm
  • Middle part abducts arm
  • Posterior part extends arm

6

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Teres major

Innervation: lower subscapular nerve

Action: adducts and medially rotates arm

7

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Tricaps brachii

Innervation: radial nerve

Action: cheif extensor of forearm

8

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Teres minor

Innervation: axillary nerve

Action: laterally rotates arm

9

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Supraspinatus

Innervation: suprascapular nerve

Action: assists deltoid with abduction of arm

10

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Infraspinatus

Innervation: suprascapular nerve

Action: laterally rotates arm

11

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Subscapularis

Innervation: 

  • Upper subscapular nerve
  • Lower sucscapular nerve

Action: medially rotates arm

 

12

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Pectoralis major

Innervation:

  • Lateral pectoral nerve
  • Medial mectoral nerve

Action: adducts and medially rotates humerous

 

13

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Pectoralis minor

Innervation: medial pectoral nerve

Action: stabalizes scapula by drawing it inferiorly and anteriorly against thoracic wall

14

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Serratus anterior

Innervation: long thoracic nerve

Action: protracts scapula and holds it against thoracic wall and rotates scapula

15

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Sternocleidomastoid

Innervation: accessory nerve (CN XI)

Action:

  • Unilateral contraction causes lateral flexion
  • Bilateral contraction causes elevation of head

16

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Inferior belly of the omohyoid muscle

Innervation: cervical plexus (ansa cervicalis)

Action: depresses hyoid bone

17

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Anterior, middle, and posterior scalene muscles

 

18

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Coracobrachialis

Innervation: musculocutaneous nerve

Action: helps flex and adduct arm (resists dislocation of shoulder)

19

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Biceps brachii

Innervation: musculocutaneous nerve

Action: supinates and flexes forearm

20

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Brachialis

Innervation: musculocutaneous and radial nerves

Action: flexes forearm

21

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Brachioradialis

Innervation: radial nerve

Action: flexion of forearm (weak)

22

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Supinator

Innervation: radial nerve

Action: supinates forearm

23

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Pronator teres

Innervation: median nerve

Action: pronates and flexes forearm (at elbow)

24

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Flexor carpi ulnaris

Innervation: ulnar nerve

Action: flexes and adducts hand (at wrist)

25

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Aconeus

Innervation: radial nerve

Action: assists tricepts in extending forearm

26

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Flexor carpi radialis

Innervation: median nerve

Action: flex and adduct hand (at wrist)

27

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Flexor digitorum superficialis

Innervation: median nerve

Action: flexes middle phalanges at PIP joints and flexes proximal phalanges at MCP joints

28

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Palmaris longus

Innervation: median nerve

Action: flexes hand (at wrist) and tenses palmar apneurosis

29

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Flexor digitorum profundus

Innervation: ulnar nerve (medial part) anterior interosseous nerve (lateral part)

Action: flexes distal phalanges 2 and 3 ar DIP joint (medial part) flexis distal phalanges 2 and 3 at DIP joint (lateral part)

30

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Flexor pollicis longus

Innervation: anterior interosseous nerve

Action: flexes phalanges of first digit (thumb)

31

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Abductor pollicis brevis

Innervation: recurrent branch of median nerve

Action: abducts thumb, helps oppose it

32

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Flexor pollicis brevis

Innervation: recurrent branch of median nerve

Action: flexes thumb

33

Opponens pollicis

Innervation: recurrent branch of median nerve

Action: to oppose thumb, draws 1st metacarpal medially to center of palm and rotates it medially

34

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Adductor pollicis

Innervation: deep branch of ulnar nerve

Action: adducts thumb towards lateral border of palm

35

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Palmar interosseous muscles

Innervation: deep branch of ulnar nerve

Action: adduct 2nd, 4th, and 5th digits toward axial line, assist lumbricles in flexing MCP joints and extending interphalangeal joints

36

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Dorsal interosseous muscles

Innervation: deep branch of ulnar nerve

Action: abduct 2nd through 4th difits from axial line, act with lumbricals in flexing MCP joints and extending interphalangeal joints

37

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Extensor carpi radialis longus

Innervation: radial nerve

Action: extend and abduct hand at wrist joint (active during fist clenching)

38

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Extensor carpi radialis brevis

Innervation: deep branch of radial nerve

Action: extend and abduct hand at the wrist joint

39

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Extensor digitorum

Innervation: posterior  interosseous nerve

Action: extends medial four digits primarily at MCP joints, secondarily at interphalangeal joints

40

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Extensor digiti minimi

Innervation: posterior interosseous nerve

Action: extends 5th digit primarily at MCP joint, secondarily at interphalangeal joint

41

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Extensor carpi ulnaris

Innervation: posterior interosseous nerve

Action: extends and adducts hand at wrist joint

42

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Abductor pollicis longus

Innervation: posterior interosseous nerve

Action: abducts thumb and extends it at carpometacarpal joint

43

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Extensor pollicis brevis

Innervation: posterior interosseous nerve

Action: extends proximal phalanx of thumb at MCP joint and extends carpometacarpal joint

44

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Extensor pollicis longus

Innervation: posterior interosseous nerve

Action: extends distal phalanx of thumb at interphalangeal joint and extends MCP and CMC joints

45

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Extensor indicis

Innervation: posterior interosseous nerve

Action: extends 2nd digit (enabling its independent extension) and helps extend hand at wrist

46

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Pronator quadratus

Innervation: anterior interosseous nerve

Action: pronates forearm (deep fibers bind radius and ulna together)