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Anatomy > Unit 2 - Chest + Upper Arm > Flashcards

Unit 2 - Chest + Upper Arm Flashcards

- Actions - Innervations - Proximal Attachment - Distal Attachment

1
Q

Origin (prox. attachment) – surpaspinatus m.

A

supraspinous fossa of scapula

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2
Q

Insertion (dist. attachment) – supraspinatus m.

A

superior facet of greater tubercle of humerus

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3
Q

Innervation – supraspinatus m.

A

suprascapular n. (C4, C5, C6)

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4
Q

Action – supraspinatus m.

A
  • initiates & helps deltoid abduct shoulder joint
  • acts w/ other rotator cuff muscles
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5
Q

Origin (prox. attachment) – infraspinatus m.

A

infraspinous fossa of scapula

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6
Q

Insertion (dist. attachment) – infraspinatus m.

A

middle facet of greater tubercle of humerus

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7
Q

Innervation – infraspinatus m.

A

suprascapular nerve (C5, C6)

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8
Q

Action – infraspinatus m.

A
  • laterally rotates arm
  • acts w/ other rotator cuff muscles
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9
Q

Origin (prox. attachment) – teres major m.

A

posterior surface of inferior angle of scapula

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10
Q

Insertion (dist. attachment) – teres major m.

A

medial lip of intertubercular sulcus of humerus

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11
Q

Innervation – teres major m.

A

lower subscapular n. (C5, C6)

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12
Q

Action – teres major m.

A

adducts & medially rotates arm

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13
Q

Origin (prox. attachment) – teres minor m.

A

middle part of lateral border of scapula

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14
Q

Insertion (dist. attachment) – teres minor m.

A

inferior facet of greater tubercle of humerus

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15
Q

Innervation – teres minor m.

A

axillary n. (C5, C6)

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16
Q

Action – teres minor m.

A

laterally rotates arm
- rotator cuff muscle

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17
Q

Origin (prox. attachment) – pectoralis major m.

A
  • clavicular head = anterior surface, medial half of clavicle
  • sternocostal head =
  • anterior surface of sternum
  • superior 6 costal cartilage
  • aponeurosis of external oblique
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18
Q

Insertion (dist. attachment) – pectoralis major m.

A

lateral lip of intertubercular sulcus of humerus

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19
Q

Innervation – pectoralis major m.

A

lateral & medial pectoral nerves

clavicular head = C5 and C6
sternocostal head = C7, C8, T1

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20
Q

Action – pectoralis major m.

A
  • adducts & medially rotates humerus
  • draws scapula anteriorly and inferiorly
  • Alone = [clavicular] flexes humerus; [sternocostal] extends humerus
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21
Q

Origin (prox. attachment) – pectoralis minor m.

A

3rd - 5th ribs near costal cartilages

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22
Q

Insertion (dist. attachment) – pectoralis minor m.

A

medial border & superior surface of coracoid process of scapula

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23
Q

Innervation – pectoralis minor m.

A

medial pectoral n. (C8, T1)

24
Q

Action – pectoralis minor m.

A
  • draws scapula inferiorly and anteriorly against thoracic wall = stabilizes scapula
25
Q

Origin (prox. attachment) – serratus anterior m.

A

lateral external surfaces of 1st - 8th ribs

26
Q

Insertion (dist. attachment) – serratus anterior m.

A

anterior surface medial border of scapular

27
Q

Innervation – serratus anterior m.

A

long thoracic n. (C5, C6, C7)

28
Q

Action – serratus anterior m.

A
  • protracts scapula
  • holds it against thoracic wall
  • rotates scapula
29
Q

Origin (prox. attachment) – deltoid m.

A

lateral third of clavicle; acromion and spine of scapula

30
Q

Insertion (dist. attachment) – deltoid m.

A

deltoid tuberosity of humerus

31
Q

Innervation – deltoid m.

A

axillary n. (C5, C6)

32
Q

Action – deltoid m.

A
  • clavicular = flexes & medially rotates arm
  • acromial = abducts arm
  • spinal = extends and laterally rotates arm
33
Q

Origin (prox. attachment) – subscapularis m.

A

subscapular fossa

34
Q

Insertion (dist. attachment) – subscapularis m.

A

lesser tubercle of humerus

35
Q

Innervation – subscapularis m.

A

upper and lower subscapular n. (C5, C6, C7)

36
Q

Action – subscapularis m.

A
  • medially rotates arm
  • rotator cuff muscle
  • helps hold head of humerus in glenoid cavity
37
Q

Innervation – coracobrachialis m.

A

musculocutaneous n. (C5, C6, C7)

38
Q

Action – coracobrachialis m.

A

helps flex & adduct arm
* resists shoulder dislocation

39
Q

Origin (prox. attachment) – biceps brachii m.

A
  • short head = tip of coracoid process of scapula
  • long head = supraglenoid tubercle of scapula
40
Q

Insertion (dist. attachment) – biceps brachii m.

A

radial tuberosity and fascia of forearm via bicipital aponeurosis

41
Q

Innervation – biceps brachii m.

A

musculocutaneous n. (C5, C6, C7)

42
Q

Action – biceps brachii m.

A
  • supinates forearm
  • flexes forearm in supine
  • short head = resists shoulder dislocation
43
Q

Origin (prox. attachments) – brachialis m.

A

distal 1/2 of anterior surface of humerus

44
Q

Insertion (dist. attachment) – brachialis m.

A

coronoid process & tuberosity of ulna

45
Q

Innervation – brachialis m.

A

musculocutaneous n. ; radial n.

(C5 and C7)

46
Q

Action – brachialis m.

A

flexes forearm in all positions

47
Q

Origin (prox. attachment) – brachioradialis m.

A

proximal 2/3 of lateral supracondylar ridge of humerus

48
Q

Insertion (dist. attachment) – brachioradialis m.

A

lateral surface of distal end of radius; proximal to styloid process

49
Q

Innervation – brachioradialis m.

A

radial n. (C5, C6, C7)

50
Q

Action – brachioradialis m.

A
  • relatively weak elbow joint flexion
  • maximal when forearm is midpronated position
51
Q

Origin (prox. attachment) – triceps brachii m.

A

Long head = infraglenoid tubercle of scapula

Lateral head = posterior surface of humerus, superior to radial groove

52
Q

Insertion (dist. attachment) – triceps brachii m.

A
  • Proximal end of olecranon of ulna
  • forearm fascia
53
Q

Innervation – triceps brachii m.

A

radial n. (C6, C7, C8)

54
Q

Action – triceps brachii m.

A
  • chief extensor of elbow joint
  • long head = extends shoulder joint, resists humerus dislocation
55
Q

Innervation – anconeus m.

A

Radial n. (C7, C8, T1)

56
Q

Action – anconeus m.

A
  • helps triceps in extending elbow joint
  • stabilizes elbow joint
  • abduct ulna during pronation

Anatomy (9 decks)

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