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Gross Anatomy > Upper Extremity Muscles Week 1 > Flashcards

Upper Extremity Muscles Week 1 Flashcards

0
Q

Supraspinatus insertion (distal attachment)

A

Superior facet of greater tubercle of humerus

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1
Q

Supraspinatus origin (proximal attachment)

A

Supraspinous fossa of scapula

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2
Q

Supraspinatus innervation

A

Suprascapular nerve (C4, C5, C6)

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3
Q

Supraspinatus action

A

Initiates and assists deltoid in abduction of shoulder joint and acts with other rotator cuff muscles

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4
Q

Infraspinatus origin (proximal attachment)

A

Infraspinous fossa of scapula

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5
Q

Infraspinatus insertion (distal attachment)

A

Middle facet of greater tubercle of humerus

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6
Q

Infraspinatus innervation

A

Suprascapular nerve (C5, C6)

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7
Q

Infraspinatus action

A

Laterally rotates shoulder joint; helps hold humeral head in glenoid cavity of scapula

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8
Q

Teres minor origin (proximal attachment)

A

Middle part of lateral border of scapula

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9
Q

Teres minor insertion (distal attachment)

A

Inferior facet of greater tubercle of humerus

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10
Q

Teres minor innervation

A

Axillary nerve (C5, C6)

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11
Q

Teres minor action

A

Laterally rotates shoulder joint; helps hold humeral head in glenoid cavity of scapula

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12
Q

Subscapularis origin (proximal attachment)

A

Subscapular fossa (most of anterior surface of scapula)

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13
Q

Subscapularis insertion (distal attachment)

A

Lesser tubercle of humerus

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14
Q

Subscapularis innervation

A

Upper and lower subscapular nerves (C5, C6, C7)

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15
Q

Subscapularis action

A

Medially rotates and adducts shoulder joint; helps hold humeral head in glenoid cavity

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16
Q

Teres major origin (proximal attachment)

A

Inferior part of lateral border of scapula and posterior surface of inferior angle of scapula

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17
Q

Teres major insertion (distal attachment)

A

Medial lip of intertubercular sulcus of humerus

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18
Q

Teres major innervation

A

Lower subscapular nerve (C5, C6)

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19
Q

Teres major action

A

Adducts and medially rotates shoulder joint

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20
Q

Deltoid origin (proximal attachment)

A

Lateral third of clavicle; acromion and spine of scapula

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21
Q

Deltoid insertion (distal attachment)

A

Deltoid tuberosity of humerus

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22
Q

Deltoid innervation

A

Axillary nerve (C5, C6)

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23
Q

Deltoid action

A

Clavicular (anterior) part flexes and medially rotates shoulder joint
Acromial (middle) part abducts shoulder joint
Spinal (posterior) part extends and laterally rotates shoulder joint

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24
Q

Pectoralis major origin (proximal attachment)

A

Clavicular head: anterior surface of medial half of clavicle

Sternocostal head: anterior surface of sternum, superior six costal cartilages, aponeurosis of external oblique muscle

25
Q

Pectoralis major insertion (distal attachment)

A

Lateral lip of intertubercular sulcus (groove) of humerus

26
Q

Pectoralis major innervation

A

Lateral/Medial pectoral nerves, clavicular head (C5, C6), sternocostal head (C7, C8, T1)

27
Q

Pectoralis major action

A

Adducts and medially rotates shoulder joint, draws scapula anteriorly and inferiorly
Clavicular head flexes shoulder joint and sternocostal head extends it from the flexed position

28
Q

Pectoralis minor origin (proximal attachment)

A

3rd-5th ribs near their costal cartilages

29
Q

Pectoralis minor insertion (distal attachment)

A

Medial border and superior surface of coracoid process of scapula

30
Q

Pectoralis minor innervation

A

Medial pectoral nerve (C8, T1)

31
Q

Pectoralis minor action

A

Stabilizes scapula by drawing inferiorly and anteriorly against thoracic wall

32
Q

Serratus anterior origin (proximal attachment)

A

External surfaces of lateral parts of 1st-8th ribs

33
Q

Serratus anterior insertion (distal attachment)

A

Anterior surface of medial border of scapula

34
Q

Serratus anterior innervation

A

Long thoracic nerve (C5, C6, C7)

35
Q

Serratus anterior action

A

Protracts scapula and holds against thoracic wall; rotates scapula

36
Q

Subclavius origin (proximal attachment)

A

Junction of first rib and its costal cartilage

37
Q

Subclavius insertion (distal attachment)

A

Inferior surface of middle third of clavicle

38
Q

Subclavius innervation

A

Subclavian nerve (C5, C6)

39
Q

Subclavius action

A

Anchors/depresses clavicle

40
Q

Biceps brachii origin (proximal attachment)

A

Short head: tip of coracoid process of scapula

Long head: supraglenoid tubercle of scapula

41
Q

Biceps brachii insertion (distal attachment)

A

Tuberosity of radius and fascia of forearm via bicipital aponeurosis

42
Q

Biceps brachii innervation

A

Musculocutaneous nerve (C5, C6)

43
Q

Biceps brachii action

A

Supinates forearm and flexes elbow joint while supinated
Flexes shoulder joint
Short head resists dislocation of shoulder

44
Q

Coracobrachialis origin (proximal attachment)

A

Tip of coracoid process of scapula

45
Q

Coracobrachialis insertion (distal attachment)

A

Middle third of medial surface of humerus

46
Q

Coracobrachialis innervation

A

Musculocutaneous nerve (C5, C6, C7)

47
Q

Coracobrachialis action

A

Helps to flex/adduct shoulder joint

Resists dislocation of shoulder

48
Q

Brachialis origin (proximal attachment)

A

Distal half of anterior surface of humerus

49
Q

Brachialis insertion (distal attachment)

A

Coranoid process and tuberosity of ulna

50
Q

Brachialis innervation

A

Musculocutaneous nerve (C5, C6)

51
Q

Brachialis action

A

Flexes elbow joint in all positions

52
Q

Triceps brachii origin (proximal attachment)

A

Long head: infraglenoid tubercle of scapula
Lateral head: posterior surface of humerus, superior to radial groove
Medial head: posterior surface of humerus, inferior to radial groove

53
Q

Triceps brachii insertion (distal attachment)

A

Proximal end of olecranon of ulna and fascia of forearm

54
Q

Triceps brachii innervation

A

Radial nerve (C6, C7, C8)

55
Q

Triceps brachii action

A

Chief extensor of elbow joint
Long head extends shoulder joint and resists dislocation of humerus
(especially important during abduction)

56
Q

Omohyoid origin

A

Superior border of scapula near suprascapular notch

57
Q

Omohyoid insertion

A

Inferior border of hyoid

58
Q

Omohyoid innervation

A

C1-C3 (by a branch of ansa cervicalis)

59
Q

Omohyoid action

A

Depresses, retracts, and steadies hyoid

Gross Anatomy (6 decks)

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