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MSK Midterm > Upper Extremity Muscles > Flashcards

Upper Extremity Muscles Flashcards

1
Q

Pectoralis Major

A

A: Adduct humerus, medially rotate humerus

  • Clavicular head: flex humerus
  • Sternocostal head: extend flexed humerus

I: Medial + Lateral pectoral N.

BS: Thoracoacromial trunk, pectoral branch

Attaches @ Front of the humerus (lateral edge of intertubercular groove of humerus)

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2
Q

Pectoralis Minor

A

A: Stabilize scapula by depression and protraction

I: Medial pectoral N.

BS: Thoracoacromial trunk (pectoral branch)

Attaches @ coracoid process of scapula

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3
Q

Subclavius

A

A: Stabilize + depress clavicle

I: N. to the subclavius M.

BS: Thoracoacromial trunk (clavicular branch)

Attaches @ Inferior aspect middle clavicle

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4
Q

Serratus Anterior

A

A: Protract scapula, stabilize scapula against the thoracic wall, rotate glenoid cavity superiorily

I: Long thoracic N.

BS: Lateral thoracic artery

Attaches @ Deep surface of the medial border of the scapula

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5
Q

Deltoid

A

A:

  • Clavicular (anterior) part: flex humerus, medially rotate humerus
  • Acromial (middle) part: Abduct humerus
  • Spinal (posterior) part: extend humerus, laterally (externally) rotate humerus

I: Axillary N.

BS: Posterior circumflex humeral artery

Attaches @ Deltoid tuberosity of the humerus

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6
Q

Subscapularis (rotator cuff muscle)

A

A: Medially (internally) rotate humerus, Adduct humerus, Hold humeral head in glenoid cavity

I: Superior subscapular N. + Inferior subscapular N.

BS: Subscapular A.

Attaches @ Front of humerus (lesser tubercle)

-fills the whole scapular fosssa

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7
Q

Supraspinatus (rotator cuff muscle)

A

A: Abduct humerus + Hold humeral head in glenoid cavity

I: Suprascapular N.

BS: Suprascapular artery

Attaches @ top of humerus (Greater humeral tubercle)

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8
Q

Infraspinatus (rotator cuff muscle)

A

A: laterally rotate humerus + hold humeral head in glenoid cavity

I: Suprascapular N.

BS: Suprascapular artery and circumflex scapular artery

Attaches @ back of humerus (greater humeral tubercle)

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9
Q

Teres Minor (rotator cuff muscle)

A

A: Laterally rotate humerus + hold humeral head in glenoid cavity

I: Axillary N.

BS: Circumflex scapular artery

Attaches @ back of humerus (greater humeral tubercle)

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10
Q

What are the 4 rotator cuff muscles?

A
  1. Subscapularis
  2. Supraspinatus
  3. Infraspinatus
  4. Teres Minor

(SITS)

-Hold humerus in place-

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11
Q

Teres Major

A

A: Adduct humerus + Medially rotate the humerus

I: Inferior subscapular N.

BS: Circumflex scapular artery

Attaches @ front of the humerus (medial edge intertubecular groove)

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12
Q

Biceps Brachii (long head + short head)

A

A: flex humerus + flex supine forearm + supinate forearm + short head resists shoulder dislocation

I: Musculocutaneous N.

BS: Brachial artery

Attaches @ Radial tuberosity & Antebrachial fascia as bicipital aponeurosis

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13
Q

Coracobrachialis

A

A: Flex humerus + adduct humerus

I: Musculocutaneous

BS: Brachial artery

Attaches @ Medial humeral body

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14
Q

Brachialis

A

A: Flex forearm (elbow)

I: Musculocutaneous N.

BS: Radial recurrent artery

Attaches @ Ulnar Tuberosity

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15
Q

Triceps Brachii (long + medium + short head)

A

A: Extend forearm (elbow extensor), (long head) resists shoulder dislocation, extend humerus, adducts humerus

I: Radial N.

BS: Deep brachial artery

Attaches @ Olecranon process of ulna + Antebrachial fascia

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16
Q

Anconeus

A

A: Extend forearm, Stabilizes elbow joint & abducts the ulna during pronation

I: Radial N.

BS: Deep brachial artery, interosseus recurrent artery

Attaches @ Lateral aspect of olecranon (top) of ulna

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17
Q

Pronator teres

A

A: Pronate forearm + flex forearm

I: Median N.

BS: Ulnar artery, radial artery

Attaches @ lateral aspect of radius

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18
Q

Flexor Carpi Radialis

A

A: Flex hand @ wrist + Abduct hand @ wrist

I: median N.

BS: Ulnar A.

Attaches @ Anterial base of 2nd metacarpal

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19
Q

Palmaris longus

A

A: Flex hand at wrist + Tense palmar aponeurosis

I: Median N.

BS: Ulnar A.

Attaches @ Palmar aponeurosis

20
Q

Flexor Carpi Ulnaris

A

A: Flex hand @ wrist + Adduct hand @ wrist

I: Ulnar N.

BS: Ulnar A.

Attaches @ Pisiform

21
Q

Flexor Digitorum Superficialis

A

A: Flex forearm + Flex hand @ wrist + Flex digits (metacarpophalangeal joint + Flex proximal interphalangeal joint)

I: Median N.

BS: Ulnar A.

Attaches @ middle phalanges (it splits its tendon like a snake)

22
Q

Flexor digitorum profundus

A

A: Flex hand @ wrist + Flex metacapopholangeal joint + Flex proximal interphalangeal joint + Flex interphalangeal joint

I:

  • Lateral part: Anterior interosseous N.
  • Medial part: ulnar N.

BS: Ulnar artery + anterior interosseous artery

Attaches @ Distal phalanges

23
Q

Flexor Pollicis Longus

A

A: Flex hand @ wrist + Flex 1st carpometacarpal joint + Flex 1st metacarpophalangeal joint + Flex 1st interphalangeal joint

I: Anterior interosseous N.

BS: Anterior interosseous artery

Attaches @ distal thumb (pollex)

24
Q

Pronator Quadratus

A

A: Pronate forearm (holds ulna and radius together)

I: Anterior interosseous N.

BS: Anterior interosseous artery

Attaches @ Anterior distal radius

25
Q

Bracioradialis

A

A: Flex forearm

I: Radial N.

BS: Radial recurrent artery

Attaches @ Lateral distal radius

26
Q

Extensor carpi radialis longus

A

A: Extend hand @ wrist + Abduct hand @ wrist

I: Radial N.

BS: Radial A.

Attaches @ Base of 2nd metacarpal

27
Q

Extensor Carpi Radialis Brevis

A

A: Extend hand @ wrist + Abduct hand @ wrist

I: Deep radial N.

BS: Radial artery

Attaches @ Base of 3rd metacarpal

28
Q

Extensor Digitorum

A

A: Extend hand @ wrist +

  • extend digits 2-5 @
  • metacarpophalangeal joint
  • proximal interphalangeal joint
  • distal interphalangeal joint

I: Posterior interosseous N.

BS: Posterior interosseous artery

Attaches @ Extensor expansion digits 2-5

29
Q

Extensor Digiti Minimi

A
  • A: Extend @ 5th digit*
  • metacarpophalangeal joint
  • proximal interphalangeal joint
  • distal interphalangeal joint

I: Posterior interosseous N.

BS: Posterior interosseous artery

Attaches @ extenser expansion 5th digit

30
Q

Extensor Carpi Ulnaris

A

A: Extend hand @ wrist + Adduct hand @ wrist

I: Posterior interosseous N.

BS: Ulnar artery

Attaches @

31
Q

Supinator

A

A: Supinate forearm

I: Deep radial N.

BS: Radial recurrent artery

Wraps around and Attaches @ Anterior Radius

32
Q

Extensor Indicis

A

A: Extend hand @ wrist + extend index finger

I: Posterior interosseous N.

BS: Posterior interosseous artery

Attaches @ Extensor expansion 2nd digit

33
Q

Abductor Pollicis Longus

A

A: Abduct hand @ wrist + Abduct pollex (radial flexion)

I: Posterior interosseous N.

BS: Posterior interosseous artery

Attaches @ Base of thumb metacarpal

34
Q

Extensor Pollicis Brevis

A

A: Abduct hand @ wrist (radial flexion) + Extend pollex

I: Posterior interosseous N.

BS: Posterior interosseous artery

Attaches @ proximal pollex

35
Q

Extensor Pollicis Longus

A

A: Abduct hand @ wrist (radial flexion) + extend pollex

I: Posterior interosseous N.

BS: Posterior interosseous artery

Attaches @ Distal thumb

36
Q

Abductor Pollicis Brevis

A

A: Abduct pollex (thumb)

I: Recurrent branch median N.

BS: Raidal A.

Attacehes @ Base of thumb (proximal phalanx pollex)

37
Q

Flexor Pollicis Brevis

A

A: Flex pollex

I:

  • Superficial head: recurrent branch median N.
  • Deep head: deep ulnar N.

BS: Radial A.

Attaches @ base of thumb

38
Q

Opponens Pollicis

A

A: Oppose pollex (thumb)

I: Recurrent branch median N.

BS: Radial A.

Attaches @ Lateral thumb metacarpal

39
Q

Adductor Pollicis

A

A: Adduct pollex (thumb)

I: Deep ulnar N.

BS: Deep palmar arterial arch

Attaches @ base of thumb (proximal phalanx)

40
Q

Abductor Digiti Minimi

A

A: Abduct 5th digit

I: Deep ulnar N.

BS: Ulnar Artery

Attaches @ Medial base of proximal phalanx 5th digit

41
Q

Flexor Digiti Minimi Brevis

A

A: Flex proximal phalanx 5th digit

I: Deep ulnar N.

BS: Ulnar A.

Attaches @ Medial base of proximal phalanx 5th digit

42
Q

Opponens Digiti Minimi

A

A: Oppose 5th digit (touch pinky to thumb)

I: Deep ulnar N.

BS: Ulnar A.

Attaches @ Medial 5th metacarpal

43
Q

1st and 2nd Lumbrical Muscles

A

A: Flex metacarpophalangeal joint + Extend proximal interphalangeal joint + Extend distal interphalangeal joint

I: Median N.

BS: Superficial palmar arch, common palmar arteries, deep palmar arch, dorsal digital arteries

Come off of flexor digitorum profundus tendon and attach @ Extensor expansion

44
Q

3rd and 4th Lumbrical Muscles

A

A: Flex metacarpophalangeal joint + Extend proximal interphalangeal joint + Extend distal interphalangeal joint

I: Deep ulnar N.

BS: Superficial palmar arch, common palmar digital arteries, deep palmar arch, dorsal digital arteries

Come off of flexor digitorum profundus tendon and attach @ Extensor expansion

45
Q

Dorsal Interossei Muscles (1-4 DAB)

A

A:

  • Abduct 2nd digit laterally, 3rd digit on both directionns, 4th digit medially
  • Flex metacarpophalangeal joint (digits 2-4)
  • Extend proximal interphalangeal joint (digits 2-4)
  • Extend distal interphalangeal joint (digits 2-4)

I: Deep ulnar N.

BS: Dorsal and palmar metacarpal arteries

Attaches @ Bases of Proximal phalanges & Extensor expansions

46
Q

Palmar Interossei Muscles (1-3 PAD)

A

A:

  • Adduct 2nd digit medially, 4th and 5th digits laterally
  • Flex metacarpophalangeal joint (digits 2, 4, 5)
  • Extend proximal interphalangeal joint (digits 2, 4, 5)
  • Extend distal interphalangeal joint (digits 2, 4, 5)

I: Deep ulnar N

BS: Palmar metacarpal arteries

Attaches @ Bases of Proximal phalanges & Extensor expansions

MSK Midterm (6 decks)

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