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MSK (Musculoskeletal) Midterm > Lecture 10: Upper Extremity Myology > Flashcards

Lecture 10: Upper Extremity Myology Flashcards

(59 cards)

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1
Q

What are the 4 Thoracoappendicular Muscles?

A
  1. Pectoralis Major M.
  2. Pectoralis Minor M.
  3. Subclavius M.
  4. Serratus Anterior M.
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2
Q

Pectoralis Major M. action

A
  • ADduct/medially rotate Humerus
  • protract/depress Scapula
  • flex humerus
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3
Q

Pectoralis Minor M. action

A
  • protract/depress Scapula (stabilize)
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4
Q

Subclavius M. action

A

positions/depresses clavicle

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5
Q

Serratus Anterior M. action

A
  • protracts scapula

- rotates Glenoid Cavity superiorly

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6
Q

What is “Winging of the Scapula” and what are its symptoms?

A
  • Paralysis of Serratus Anterior from Long Thoracic N. injury
  • abducting upper limb beyond horizontal position difficult
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7
Q

What are the 4 Rotator Cuff muscles and what is their common function?

A
  1. Supraspinatous M.
  2. Infraspinatous M.
  3. Subscapularis M.
  4. Teres Minor M.
  • hold humeral head in Glenoid Cavity
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8
Q

Deltoid M. actions (Anteior, Middle, Posterior)

A

Anterior –> flex/medially rotate humerus

Middle –> ABduct humerus

Posterior –> extend/laterally rotate humerus

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9
Q

Subscapularis M. action

A
  • medially rotate, ADduct humerus
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10
Q

Supraspinatous M. action

A
  • ABduct humerus
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11
Q

Infaspinatous M. action

A
  • laterally rotates humerus
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12
Q

Teres Minor M. action

A
  • laterally rotates humerus
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13
Q

Teres Major M. action

A
  • ADduct/medially rotate humerus
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14
Q

Which Rotator Cuff Muscle is the most commonly torn and what does damage to the Rotator Cuff lead to?

A
  • Supraspinatous muscle

- injure or tear leads to instability to Glenohumeral Joint

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15
Q

Biceps Brachii M action

A
  • flex humerus, supine forearm
  • supinates forearm

Short Head resists dislocation

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16
Q

Bicipital Myotactic Reflex

A
  • strike Bicipital Tendon w/reflex hammer = reflex

- no reflex = damaged to Musculocutaneous N. or C5/C6 Anterior Rami

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17
Q

Biceps Tendinitis and “Popeye Deformity”

A
  • repetitive movement of Biceps Long Head through Intertuburcular Groove can cause inflammation
  • Long Head separates from groove = muscle balling up in the mid arm
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18
Q

Coracobrachialis M. action

A
  • flex/ADduct humerus
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19
Q

Brachioradialis M. action

A
  • flex forearm
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20
Q

Triceps Brachii M. action

A
  • extend forearm

Long Head resists dislocation

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21
Q

Anconeus M. action

A
  • stabilizes elbow joint

- w/Triceps = extend forearm

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22
Q

What are the 4 superficial flexor muscles?

A
  1. Pronator Teres M.
  2. Flexor Carpi Radialis M.
  3. Palmaris Longus M.
  4. Flexor Carpi Ulnaris M.
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23
Q

Pronator Teres M. action

A
  • pronate/flex forearm
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24
Q

Flexor Carpi Radialis M. action

Study These Flashcards
A
  • flex forearm

- flex/ABduct hand @ wrist

25
Palmaris Longus M. action
- flex forearm | - flex hand and tenses palmar aponeurosis
26
Flexor Carpi Ulnaris M. action
- flex forearm | - flex/ADduct hand @ wrist
27
What is the intermediate flexor muscle?
Flexor Digitorum Superficialis M.
28
Flexor Digitorum Superficialis M.
- flex forearm - flex hand @ wrist - flex 2-5 digit proximal and intermediate phalanges
29
What are the 3 deep flexor muscles?
1. Flexor Digitorum Profundus M. 2. Flexor Pollicis Longus M. 3. Pronator Quadratus M.
30
Flexor Digitorum Profundus M. action
- flex hand @ wrist | - flex ALL phalanges of digits 2-5 at ALL joints
31
Flexor Pollicis Longus M. action
- flex hand @ wrist - flex both thumb phalanges at Intercarpal Joint - ABduct 1st metacarpal at 1st Carpometacarpal Joint
32
Pronator Quadratus M. action
- pronate forearm | - deeply hold Radius and Ulna together
33
What are the 6 superficial extensor muscles?
1. Brachioradialis M. 2. Extensor Carpi Radialis Longus M. 3. Extensor Carpi Radialis Brevis M. 4. Extensor Digitorum M. 5. Extensor Digiti Minimi M. 6. Extensor Carpi Ulnaris M.
34
Brachioradialis M. action
- flex forearm
35
Extensor Carpi Radialis Longus M. action
- extend/ABduct hand @ wrist
36
Extensor Carpi Radialis Brevis M. action
- extend/ABduct hand @ wrist
37
Extensor Digitorum M. action
- extend hand @ wrist | - extend all phalanges of digits 2-5 at all joints
38
Extensor Digiti Minimi M. action
- extend all phalanges of digit 5 at all joints
39
Extensor Carpi Ulnaris M. action
- extend/ADduct hand @ wrist
40
What is "Tennis Elbow"?
- repetitive use of Superficial Extensors | - pain over Lateral Epicondyle and down posterior forearm
41
What are the 2 deep extensor muscles?
1. Supinator M. | 2. Extensor Indicis M.
42
Supinator M. action
- supinate forearm
43
Extensor Indicis M. action
- extend hand @ wrist | - extend 2nd digit
44
What are the 3 Outcropping Muscles of the deep extensor layer? (ANATOMICAL SNUFF BOX)
1. Abductor Pollicis Longus M. 2. Extensor Pollicis Longus M. 3. Extensor Pollicis Brevis M.
45
Abductor Pollicis Longus M. action
- ABduct hand @ wrist | - ABduct thumb @ carpometacarpal joint
46
Extensor Pollicis Longus M. action
- ABduct hand @ wrist | - extend 1st metacarpal, proximal, and distal phalanges of thumb
47
Extensor Pollicis Brevis M. action
- ABduct hand | - extend 1st metacarpal and proximal phalanx
48
What structures are found in the Anatomical Snuff Box?
- Radial A. (deep to tendons) | - Superficial Radial N. (superficial to tendons)
49
What are the 4 muscles of the thenar eminence?
1. Abductor Pollicis Brevis M. 2. Opponens Pollicis M. 3. Flexor Pollicis Brevis M. 4. Adductor Pollicis M.
50
Abductor Pollicis Brevis M. action
- ABduct thumb
51
Opponens Pollicis M. action
- oppose thumb
52
Flexor Pollicis Brevis M. action
- flex 1st metacarpal and proximal phalanx of thumb
53
Adductor Pollicis M. action
- ADduct thumb
54
What are the 3 muscles of the hypothenar eminence?
1. Abductor Digiti Minimi M. 2. Flexor Digiti Minimi Brevis M. 3. Opponens Digiti Minimi M.
55
Abductor Digiti Minimi M. action
- ABduct 5th digit
56
Flexor Digiti Minimi Brevis M. action
- flex proximal phalanx of 5th digit
57
Opponens Digiti Minimi M. action
- oppose 5th digit
58
1st and 2nd Lumbrical action
- flex proximal phalanges of digits 2/3 | - extend intermediate/distal phalanges of digits 2/3 by tightening extensor expansion
59
3rd and 4th Lumbrical action
- flex proximal phalanges of digits 4/5 | - extend intermediate/distal phalanges of digits 4/5 by tightening extensor expansion

MSK (Musculoskeletal) Midterm (15 decks)

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