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

Week 11 - Arm and shoulder muscles Flashcards

(74 cards)

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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
What is the origin of the deltoid?
- Acromion process - Lateral 1/3 of Clavicle Spine of scapula
26
What is the insertion of the deltoid?
- Deltoid tuberosity of the humerus
27
What are the actions of the teres major?
- Extends arm - Medially rotates arm - Adducts arm
28
What is the innervation of the teres major?
Lower subscapular nerve (C5-C6)
29
What is the origin of the teres major
Inferior angle of scapula
30
What is the insertion of the teres major?
Intertubercular sulcus of humerus
31
What are the actions of the pectoralis major?
- Flexes arm - Horizontally adducts arm - Rotates arm medially
32
What is the innervation of the pectoralis major
Lateral pectoral nerve (C5-C7) and medial pectoral (C8-T1)
33
What is the origin of the pectoralis major?
- Medial clavicle - Sternum - Costal cartilages 1-6
34
What is the insertion of the pectoralis major?
- Greater tubercle of humerus - Lateral lip of intertubercular sulcus of humerus
35
What are the actions of the pectoralis minor?
- Depresses scapula - Elevates ribs
36
What is the innervation of the pectoralis minor?
Medial pectoral (C8-T1)
37
What is the origin of the pectoralis minor?
Anterior part of ribs 3-5
38
What is the insertion of the pectoralis minor?
Coracoid process of scapula
39
What are the muscles of the rotator cuff?
- Subscapularis - Infraspinatus - Teres minor - Subscapilaris
40
What is the action of the subscapularis?
Rotates the arm medially (agonist)
41
What is the innervation of the subscapularis
Upper and lower subscapular nerves (C5-C6)
42
What is the origin of the subscapularis?
Subscapular fossa of scapula
43
What is the insertion of the subscapularis?
Lesser tubercle of humerus
44
What is the action of the supraspinatus?
- Initiates abduction of arm
45
What is the innervation of the supraspinatus?
Suprascapular nerve (C5-C6)
46
What is the origin of the supraspinatus?
Supraspinous fossa of scapula
47
What is the insertion of the supraspinatus?
Greater tubercle of humerus
48
What is the action of the infraspinatus?
Rotates arm laterally
49
What is the innervation of the infraspinatus?
Suprascapular nerve
50
What is the origin of the infraspinatus?
Infraspinous fossa of scapula
51
What is the insertion of the infraspinatus?
Greater tubercle of the humerus
52
What is the action of the teres minor?
Rotates the arm laterally
53
What is the innervation of the teres minor
Axillary nerve
54
What is the origin of the teres minor?
Superolateral boarder of scapula
55
What is the insertion point of the teres minor?
Greater tubercle of humerus
56
What muscles make up the anterior (flexor) compartment of the arm?
- Biceps brachii - Coracobrachialis - Brachialis (deep to biceps brachii)
57
What muscles make up the posterior (extensor) compartment of the arm?
Triceps brachii
58
Which side is the biceps brachii long head vs. short head?
- Long head --> Lateral side - Short head --> medial side
59
What are the actions of the biceps brachii?
- Flexes arm (long head only) - Flexes arm/forearm - Supinates forearm
60
What is the innervation of the biceps brachii
Musculocutaneous nerve (C5-C6)
61
What is the origin of the biceps brachii?
- Long head --> supraglenoid tubercle - Short head --> Coracoid process
62
What is the insertion of the biceps brachii?
Radial tuberosity of radius
63
What are the actions of the coracobrachialis?
- Flexes and adducts the arm
64
What is the innervation of the coracobrachialis?
Musculocutaneous nerve
65
What is the origin of the coracobrachialis?
Coracoid process
66
What is the insertion of the coracobrachialis?
Medial diaphysis of humerus
67
What is the action of the brachialis?
Flexes forearm
68
What is the origin of the brachialis?
- Distal half of diaphysis of anterior humerus
69
What is the insertion of the brachialis?
Corocoid process of ulna
70
What are the actions of the triceps brachii?
- Extends arm at shoulder joint (long head only) - Extends forearm (agonist)
71
What is the innervation of the triceps brachii?
Radial nerve (c5-C7)
72
What are the insertions of the triceps brachii?
Long head --> infraglenoid tubercle Lateral head --> Posterior, proximal diaphysis of humerus Medial head: Most posterior diaphysis of humerus
73
What is the insertion of the triceps brachii
Olecranon process
74
What are the placements/arrangements of triceps brachii muscles?
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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