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KN 232 - A&P 1 Lab > Week 11 - Arm and shoulder muscles > Flashcards

Week 11 - Arm and shoulder muscles Flashcards

1
Q

What are the actions of the trapezius?

A
  • Scapular retraction
  • Rotates scapula
  • Elevates scapula
  • Depresses scapula
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2
Q

What is the innervation of the trapezius muscle?

A

Accessory nerve (CN XI)

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3
Q

What is the origin of the trapezius?

A
  • External occipital protuberance
  • Ligamentum nuchae
  • Spines of C7-T12
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4
Q

What is the insertion of the trapezius?

A
  • Scapular spine and acromion
  • Lateral 1/3 of clavicle
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5
Q

What are the actions of the latissimus dorsi?

A
  • Adducts the arm
  • Extends the arm
  • Rotates arm medially
  • Depresses scapula
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6
Q

What is the innervation of latissimus dorsi?

A

Thoracodorsal nerve (C6-C8)

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7
Q

What is the origin of the latissimus dorsi?

A
  • Iliac crest
  • Spinous process of T7-T12
  • Ribs 9-12
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8
Q

What is the insertion of the latissimus dorsi

A
  • Intertubercular sulcus of humerus
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9
Q

What is the action of the levator scapulae?

A

(Deep to trapezius)
- Elevates scapula
- Downward rotation of scapula

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10
Q

What is the innervation of the levator scapulae?

A

Dorsal scapular (C5)

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11
Q

What is the origin of the levator scapulae?

A
  • Transverse process of C1-C4
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12
Q

What is the insertion of the levator scapulae?

A
  • Superior angle of scapula
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13
Q

What is the action of the rhomboid major?

A
  • Scapular retraction
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14
Q

What is the innervation of the rhomboid major?

A

Dorsal scapular (C5)

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15
Q

What is the origin of the rhomboid major?

A
  • Spines of t2-t5
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16
Q

What is the insertion of the rhomboid major?

A

Medial boarder of scapula

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17
Q

What is the action of the rhomboid minor?

A

Scapular retraction

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18
Q

What is the innervation of the rhomboid minor?

A

Dorsal scapular (C5)

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19
Q

What is the origin of the rhomboid minor?

A

Spines of C7-t1

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20
Q

What is the insertion of the rhomboid minor?

A

Medial border of scapula

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21
Q

What are the actions of the anterior fibers of the deltoid?

A
  • Flex the arm
  • Medially rotates the arm
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22
Q

What are the actions of the middle fibers of the deltoid?

A
  • Abduct the arm (agonist)
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23
Q

What are the actions of the posterior fibers of the deltoid?

A
  • Extends the arm
  • Laterally rotates the arm
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24
Q

What is the innervation of the deltoid?

A

Axillary (C5-C6)

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25
Q

What is the origin of the deltoid?

A
  • Acromion process
  • Lateral 1/3 of Clavicle Spine of scapula
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26
Q

What is the insertion of the deltoid?

A
  • Deltoid tuberosity of the humerus
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27
Q

What are the actions of the teres major?

A
  • Extends arm
  • Medially rotates arm
  • Adducts arm
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28
Q

What is the innervation of the teres major?

A

Lower subscapular nerve (C5-C6)

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29
Q

What is the origin of the teres major

A

Inferior angle of scapula

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30
Q

What is the insertion of the teres major?

A

Intertubercular sulcus of humerus

31
Q

What are the actions of the pectoralis major?

A
  • Flexes arm
  • Horizontally adducts arm
  • Rotates arm medially
32
Q

What is the innervation of the pectoralis major

A

Lateral pectoral nerve (C5-C7) and medial pectoral (C8-T1)

33
Q

What is the origin of the pectoralis major?

A
  • Medial clavicle
  • Sternum
  • Costal cartilages 1-6
34
Q

What is the insertion of the pectoralis major?

A
  • Greater tubercle of humerus
  • Lateral lip of intertubercular sulcus of humerus
35
Q

What are the actions of the pectoralis minor?

A
  • Depresses scapula
  • Elevates ribs
36
Q

What is the innervation of the pectoralis minor?

A

Medial pectoral (C8-T1)

37
Q

What is the origin of the pectoralis minor?

A

Anterior part of ribs 3-5

38
Q

What is the insertion of the pectoralis minor?

A

Coracoid process of scapula

39
Q

What are the muscles of the rotator cuff?

A
  • Subscapularis
  • Infraspinatus
  • Teres minor
  • Subscapilaris
40
Q

What is the action of the subscapularis?

A

Rotates the arm medially (agonist)

41
Q

What is the innervation of the subscapularis

A

Upper and lower subscapular nerves (C5-C6)

42
Q

What is the origin of the subscapularis?

A

Subscapular fossa of scapula

43
Q

What is the insertion of the subscapularis?

A

Lesser tubercle of humerus

44
Q

What is the action of the supraspinatus?

A
  • Initiates abduction of arm
45
Q

What is the innervation of the supraspinatus?

A

Suprascapular nerve (C5-C6)

46
Q

What is the origin of the supraspinatus?

A

Supraspinous fossa of scapula

47
Q

What is the insertion of the supraspinatus?

A

Greater tubercle of humerus

48
Q

What is the action of the infraspinatus?

A

Rotates arm laterally

49
Q

What is the innervation of the infraspinatus?

A

Suprascapular nerve

50
Q

What is the origin of the infraspinatus?

A

Infraspinous fossa of scapula

51
Q

What is the insertion of the infraspinatus?

A

Greater tubercle of the humerus

52
Q

What is the action of the teres minor?

A

Rotates the arm laterally

53
Q

What is the innervation of the teres minor

A

Axillary nerve

54
Q

What is the origin of the teres minor?

A

Superolateral boarder of scapula

55
Q

What is the insertion point of the teres minor?

A

Greater tubercle of humerus

56
Q

What muscles make up the anterior (flexor) compartment of the arm?

A
  • Biceps brachii
  • Coracobrachialis
  • Brachialis (deep to biceps brachii)
57
Q

What muscles make up the posterior (extensor) compartment of the arm?

A

Triceps brachii

58
Q

Which side is the biceps brachii long head vs. short head?

A
  • Long head –> Lateral side
  • Short head –> medial side
59
Q

What are the actions of the biceps brachii?

A
  • Flexes arm (long head only)
  • Flexes arm/forearm
  • Supinates forearm
60
Q

What is the innervation of the biceps brachii

A

Musculocutaneous nerve (C5-C6)

61
Q

What is the origin of the biceps brachii?

A
  • Long head –> supraglenoid tubercle
  • Short head –> Coracoid process
62
Q

What is the insertion of the biceps brachii?

A

Radial tuberosity of radius

63
Q

What are the actions of the coracobrachialis?

A
  • Flexes and adducts the arm
64
Q

What is the innervation of the coracobrachialis?

A

Musculocutaneous nerve

65
Q

What is the origin of the coracobrachialis?

A

Coracoid process

66
Q

What is the insertion of the coracobrachialis?

A

Medial diaphysis of humerus

67
Q

What is the action of the brachialis?

A

Flexes forearm

68
Q

What is the origin of the brachialis?

A
  • Distal half of diaphysis of anterior humerus
69
Q

What is the insertion of the brachialis?

A

Corocoid process of ulna

70
Q

What are the actions of the triceps brachii?

A
  • Extends arm at shoulder joint (long head only)
  • Extends forearm (agonist)
71
Q

What is the innervation of the triceps brachii?

A

Radial nerve (c5-C7)

72
Q

What are the insertions of the triceps brachii?

A

Long head –> infraglenoid tubercle
Lateral head –> Posterior, proximal diaphysis of humerus
Medial head: Most posterior diaphysis of humerus

73
Q

What is the insertion of the triceps brachii

A

Olecranon process

74
Q

What are the placements/arrangements of triceps brachii muscles?

A

Superficial layer: Lateral head on lateral side, long head on medial side
Deep layer: Medial head

KN 232 - A&P 1 Lab (3 decks)

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