Muscles for Practical Flashcards

(46 cards)

1
Q
A

Trapezius

Innervation: spinal accesory nerve (CNXI)

Action:

  • Descending part elevates
  • Ascending part depresses
  • Middle part retracts
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2
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Rhomboid Major

Innervation: dorsal scapular nerve

Action: retract scapula, fix scapula to thoracic wall

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3
Q
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Rhomboid minor

Innervation: dorsal scapular nerve

Action: retract scapula, fix scapula to thoracic wall

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4
Q
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Levator scapulae

Innervation: dorsal scapular nerve

Action: elevate scapula

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5
Q
A

Deltoid

Innervation: axillary nerve

Action:

  • Anterior part flexes arm
  • Middle part abducts arm
  • Posterior part extends arm
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6
Q
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Teres major

Innervation: lower subscapular nerve

Action: adducts and medially rotates arm

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7
Q
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Tricaps brachii

Innervation: radial nerve

Action: cheif extensor of forearm

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8
Q
A

Teres minor

Innervation: axillary nerve

Action: laterally rotates arm

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9
Q
A

Supraspinatus

Innervation: suprascapular nerve

Action: assists deltoid with abduction of arm

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10
Q
A

Infraspinatus

Innervation: suprascapular nerve

Action: laterally rotates arm

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11
Q
A

Subscapularis

Innervation:

  • Upper subscapular nerve
  • Lower sucscapular nerve

Action: medially rotates arm

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12
Q
A

Pectoralis major

Innervation:

  • Lateral pectoral nerve
  • Medial mectoral nerve

Action: adducts and medially rotates humerous

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13
Q
A

Pectoralis minor

Innervation: medial pectoral nerve

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

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14
Q
A

Serratus anterior

Innervation: long thoracic nerve

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

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15
Q
A

Sternocleidomastoid

Innervation: accessory nerve (CN XI)

Action:

  • Unilateral contraction causes lateral flexion
  • Bilateral contraction causes elevation of head
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16
Q
A

Inferior belly of the omohyoid muscle

Innervation: cervical plexus (ansa cervicalis)

Action: depresses hyoid bone

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17
Q
A

Anterior, middle, and posterior scalene muscles

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18
Q
A

Coracobrachialis

Innervation: musculocutaneous nerve

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

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19
Q
A

Biceps brachii

Innervation: musculocutaneous nerve

Action: supinates and flexes forearm

20
Q
A

Brachialis

Innervation: musculocutaneous and radial nerves

Action: flexes forearm

21
Q
A

Brachioradialis

Innervation: radial nerve

Action: flexion of forearm (weak)

22
Q
A

Supinator

Innervation: radial nerve

Action: supinates forearm

23
Q
A

Pronator teres

Innervation: median nerve

Action: pronates and flexes forearm (at elbow)

24
Q
A

Flexor carpi ulnaris

Innervation: ulnar nerve

Action: flexes and adducts hand (at wrist)

25
Aconeus Innervation: radial nerve Action: assists tricepts in extending forearm
26
Flexor carpi radialis Innervation: median nerve Action: flex and adduct hand (at wrist)
27
Flexor digitorum superficialis Innervation: median nerve Action: flexes middle phalanges at PIP joints and flexes proximal phalanges at MCP joints
28
Palmaris longus Innervation: median nerve Action: flexes hand (at wrist) and tenses palmar apneurosis
29
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
Flexor pollicis longus Innervation: anterior interosseous nerve Action: flexes phalanges of first digit (thumb)
31
Abductor pollicis brevis Innervation: recurrent branch of median nerve Action: abducts thumb, helps oppose it
32
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
Adductor pollicis Innervation: deep branch of ulnar nerve Action: adducts thumb towards lateral border of palm
35
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
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
Extensor carpi radialis longus Innervation: radial nerve Action: extend and abduct hand at wrist joint (active during fist clenching)
38
Extensor carpi radialis brevis Innervation: deep branch of radial nerve Action: extend and abduct hand at the wrist joint
39
Extensor digitorum Innervation: posterior interosseous nerve Action: extends medial four digits primarily at MCP joints, secondarily at interphalangeal joints
40
Extensor digiti minimi Innervation: posterior interosseous nerve Action: extends 5th digit primarily at MCP joint, secondarily at interphalangeal joint
41
Extensor carpi ulnaris Innervation: posterior interosseous nerve Action: extends and adducts hand at wrist joint
42
Abductor pollicis longus Innervation: posterior interosseous nerve Action: abducts thumb and extends it at carpometacarpal joint
43
Extensor pollicis brevis Innervation: posterior interosseous nerve Action: extends proximal phalanx of thumb at MCP joint and extends carpometacarpal joint
44
Extensor pollicis longus Innervation: posterior interosseous nerve Action: extends distal phalanx of thumb at interphalangeal joint and extends MCP and CMC joints
45
Extensor indicis Innervation: posterior interosseous nerve Action: extends 2nd digit (enabling its independent extension) and helps extend hand at wrist
46
Pronator quadratus Innervation: anterior interosseous nerve Action: pronates forearm (deep fibers bind radius and ulna together)