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MSK Midterm > Upper Extremity Muscles > Flashcards

Upper Extremity Muscles Flashcards

(46 cards)

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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

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A

A: Flex hand at wrist + Tense palmar aponeurosis

I: Median N.

BS: Ulnar A.

Attaches @ Palmar aponeurosis

20
Q

Flexor Carpi Ulnaris

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A

A: Flex hand @ wrist + Adduct hand @ wrist

I: Ulnar N.

BS: Ulnar A.

Attaches @ Pisiform

21
Q

Flexor Digitorum Superficialis

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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

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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

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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

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A

A: Pronate forearm (holds ulna and radius together)

I: Anterior interosseous N.

BS: Anterior interosseous artery

Attaches @ Anterior distal radius

25
Bracioradialis
*A: Flex forearm* I: Radial N. BS: Radial recurrent artery **Attaches @ Lateral distal radius**
26
Extensor carpi radialis longus
A: *Extend hand @ wrist* + Abduct hand @ wrist I: Radial N. BS: Radial A. **Attaches @ Base of 2nd metacarpal**
27
Extensor Carpi Radialis Brevis
A: Extend hand @ wrist + Abduct hand @ wrist I: Deep radial N. BS: Radial artery **Attaches @ Base of 3rd metacarpal**
28
Extensor Digitorum
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
Extensor Digiti Minimi
* 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
Extensor Carpi Ulnaris
A: Extend hand @ wrist + *Adduct* hand @ wrist I: Posterior interosseous N. BS: Ulnar artery Attaches @
31
Supinator
*A: Supinate forearm* I: Deep radial N. BS: Radial recurrent artery Wraps around and Attaches @ Anterior Radius
32
Extensor Indicis
A: Extend hand @ wrist + extend index finger I: Posterior interosseous N. BS: Posterior interosseous artery **Attaches @ Extensor expansion 2nd digit**
33
Abductor Pollicis Longus
A: Abduct hand @ wrist + *Abduct pollex* (radial flexion) I: Posterior interosseous N. BS: Posterior interosseous artery **Attaches @ Base of thumb metacarpal**
34
Extensor Pollicis Brevis
A: Abduct hand @ wrist (radial flexion) + Extend pollex I: Posterior interosseous N. BS: Posterior interosseous artery **Attaches @ proximal pollex**
35
Extensor Pollicis Longus
A: Abduct hand @ wrist (radial flexion) + extend pollex I: Posterior interosseous N. BS: Posterior interosseous artery **Attaches @ Distal thumb**
36
Abductor Pollicis Brevis
A: Abduct pollex (thumb) I: Recurrent branch median N. BS: Raidal A. **Attacehes @ Base of thumb** (proximal phalanx pollex)
37
Flexor Pollicis Brevis
A: Flex pollex I: - Superficial head: recurrent branch median N. - Deep head: deep ulnar N. BS: Radial A. **Attaches @ base of thumb**
38
Opponens Pollicis
A: Oppose pollex (thumb) I: Recurrent branch median N. BS: Radial A. **Attaches @ Lateral thumb metacarpal**
39
Adductor Pollicis
A: Adduct pollex (thumb) I: Deep ulnar N. BS: Deep palmar arterial arch **Attaches @ base of thumb (proximal phalanx)**
40
Abductor Digiti Minimi
A: Abduct 5th digit I: Deep ulnar N. BS: Ulnar Artery **Attaches @ Medial base of proximal phalanx 5th digit**
41
Flexor Digiti Minimi Brevis
A: Flex proximal phalanx 5th digit I: Deep ulnar N. BS: Ulnar A. **Attaches @ Medial base of proximal phalanx 5th digit**
42
Opponens Digiti Minimi
A: Oppose 5th digit (touch pinky to thumb) I: Deep ulnar N. BS: Ulnar A. **Attaches @ Medial 5th metacarpal**
43
1st and 2nd Lumbrical Muscles
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
3rd and 4th Lumbrical Muscles
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
Dorsal Interossei Muscles (1-4 DAB)
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
Palmar Interossei Muscles (1-3 PAD)
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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