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Clinical Anatomy > Shoulder Region Muscles > Flashcards

Shoulder Region Muscles Flashcards

1
Q

Action of Brachialis

A

Flexion of forearm in all positions

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2
Q

Action of Deltoid

A

Anterior part: flexes and medially rotates arm Middle part: abducts arm Posterior part: extends and laterally rotates arm

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2
Q

Action of Coracobrachialis

A

Helps flex and adduct arm; resists dislocation of shoulder

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3
Q

Action of Latissimus Dorsi

A

Extends, adducts and medially rotates humerus Raises body towards arms during climbing

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4
Q

Action of Levator Scapulae

A

Elevates and inferior rotates scapula

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5
Q

Action of Pectoralis Major

A

Adducts, internal rotation of humerus, draws scapula anteriorly and inferiorly, flexion of humerus at clavicular head, extension of humerus from a flexed position at sternocostal head

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6
Q

Action of Pectoralis Minor

A

Stabilizes scapula by drawing it inferior and anterior along the thoracic wall

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7
Q

Action of Rhomboid Major

A

Retracts scapula and rotates to depress glenoid cavity, fix scapula to thoracic wall

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8
Q

Action of Rhomboid Minor

A

Retracts scapula and rotates to depress glenoid cavity, fix scapula to thoracic wall

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9
Q

Action of Subclavius

A

Anchors and depresses clavicle

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9
Q

Action of Serratus Anterior

A

Protraction and superior rotation of scapula

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10
Q

Action of Subscapularis

A

Medial Rotation and adduction of the Humerus

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11
Q

Action of Teres Major

A

Adducts and medially rotates the arm

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12
Q

Action of Teres Minor

A

Lateral rotation of the humerus, helps hold humers in glenoid cavity of the scapula

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12
Q

Action of the Anconeous

A

Assists triceps in extending forearm, stabilizes elbow joint; may abduct ulna during pronation

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13
Q

Action of the Biceps Brachii

A

Supination of the forearm, flexion of the forearm when supinated Short head of the Biceps Brachii resists dislocation of the shoulder

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14
Q

Action of the Infraspinatus

A

Lateral rotation of the humerus, helps hold humerus in glenoid cavity of the scapula

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16
Q

Action of the Supraspinatus

A

Initiates and assists the deltoid for horizontal abduction of the humerus

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17
Q

Action of Trapezius

A

Descending part: Elevates scapula Ascending part: Depresses Scapula Middle part: Retracts scapula Rotates glenoid superiorly

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18
Q

Innervation of Brachialis

A

Musculocutaneous nerve (C5, C6)

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18
Q

Action of Triceps Brachii

A

Chief extensor of Forearm, long head resists dislocation of the humerus (important during abduction of the arm)

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20
Q

Innervation of Coracobrachialis

A

Musculocutaenous nerve (C5, C6)

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21
Q

Innervation of Deltoid

A

Axillary nerve (C5-C6)

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22
Q

Innervation of Latissimus Dorsi

A

Thoracodorsal nerve (C6, C7, C8)

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23
Q

Innervation of Levator Scapulae

A

Dorsal Scapular (C5) and Cervical Spinal Nerves (C3-C4)

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24
Q

Innervation of Pectoralis Major

A

Lateral and Medial pectoral nerves

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25
Q

Innervation of Pectoralis Minor

A

Medial pectoral nerve

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26
Q

Innervation of Rhomboid Minor

A

Dorsal Scapular nerve (C4-C5)

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26
Q

Innervation of Rhomboid Major

A

Dorsal Scapular nerve (C4-C5)

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28
Q

Innervation of Serratus Anterior

A

Long Thoracic Nerve (C5,C6,C7)

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29
Q

Innervation of Subclavius

A

Nerve to Subclavius

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30
Q

Innervation of Subscapularis

A

Upper and Lower Subscapular nerves (C5, C6, C7)

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30
Q

Innervation of Teres Major

A

Lower Scapular Nerve (C5, C6)

31
Q

Innervation of Teres Minor

A

Axillary Nerve (C5, C6)

33
Q

Innervation of the Anconeous

A

Radial Nerve (C7, C8, T1)

34
Q

Innervation of the Biceps Brachii

A

Musculocutaneous nerve (C5, C6)

35
Q

Innervation of the Infraspinatus

A

Suprascapular nerve (C5, C6)

36
Q

Innervation of the Supraspinatus

A

Suprascapular nerve (C4, C5, C6)

37
Q

Innervation of Trapezius

A

Accessory nerve and C3 and C4 spinal nerves

38
Q

Innervation of Triceps Brachii

A

Radial Nerve, (C6, C7, C8)

39
Q

Insertion of Biceps Brachii

A

Radial Tuberosity and fascia of the forearm via Bicipital aponeurosis

40
Q

Insertion of Brachialis

A

Coronoid process and ulnar tuberosity

41
Q

Insertion of Coracobrachialis

A

Middle 1/3 of medial surface of humerus

42
Q

Insertion of Deltoid

A

Deltoid tuberosity of humerus

43
Q

Insertion of Latissimus Dorsi

A

Floor of intertubercular groove of humerus

44
Q

Insertion of Levator Scapulae

A

Medial border of scapular superior to root of spine

46
Q

Insertion of Pectoralis Major

A

Lateral Lip of intertubercular groove of humerus

46
Q

Insertion of Pectoralis Minor

A

Medial border of superior surface of the corocoid process

47
Q

Insertion of Rhomboid Major

A

Medial border of scapula from level of spine to inferior angle

48
Q

Insertion of Rhomboid Minor

A

Smooth triangular area at medial end of scapular spine

49
Q

Insertion of Serratus Anterior

A

Anterior surface of medial border of scapula

50
Q

Insertion of Subclavius

A

Inferior surface of middle 1/3 clavicle

51
Q

Insertion of Subscapularis

A

Lesser tubercle of Humerus

52
Q

Insertion of Teres Major

A

Medial lip of intertubercular groove of humerus

53
Q

Insertion of Teres Minor

A

Inferior facet of the greater tubercle of the humerus

54
Q

Insertion of the Anconeous

A

Lateral surface of olecranon and superior part of posterior surface of ulna

55
Q

Insertion of the Infraspinatus

A

Middle facet of the greater tubercle of humerus

56
Q

Insertion of the Supraspinatus

A

Superior facet of greater tubercle of humerus

57
Q

Insertion of Trapezius

A

Lateral 1/3 of clavicle, acromion and spine of scapula

58
Q

Insertion of Triceps Brachii

A

Olecranon process and fascia of forearm

59
Q

Origin of Anconeous

A

Lateral epicondyle of humerus

60
Q

Origin of Biceps Brachii

A

Short Head: Tip of Corocoid Process of scapula Long Head: Supraglenoid tubercle of Scapula

62
Q

Origin of Brachialis

A

Distal Half of Anterior surface of Humerus

63
Q

Origin of Coracobrachialis

A

Tip of coracoid process of scapula

64
Q

Origin of Deltoid

A

Lateral 1/3 of clavicle, acromion, and spine of scapula

66
Q

Origin of Latissimus Dorsi

A

Spinous processes of inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest, and inferior 3 or 4 ribs

67
Q

Origin of Levator Scapulae

A

Posterior tubercles of transverse processes C1-C4 vertebrae

68
Q

Origin of Pectoralis Major

A

Clavicular Head: Anterior Surfaces of medial 1/2 of clavicle

Sternocostal head: Anterior surface of sternum, superior six costal cartilages, aponeurosis of external oblique muscles

69
Q

Origin of Pectoralis Minor

A

3rd-5th ribs near their costal cartilages

70
Q

Origin of Rhomboid Major

A

Spinous processes of T2-T5

71
Q

Origin of Rhomboid Minor

A

Nuchal Ligament, spinous processes of C7 and T1 vertebrae

72
Q

Origin of Subclavius

A

Junction of 1st rib and its costal cartilages

72
Q

Origin of Serratus Anterior

A

External surfaces of lateral ribs 1-8

73
Q

Origin of Supraspinatus

A

Supraspinous fossa of the scapula

73
Q

Origin of Subscapularis

A

Subscapular Fossa

74
Q

Origin of Teres Major

A

Posterior surface of inferior angle of scapula

76
Q

Origin of Teres Minor

A

Middle part of lateral border of scapula

78
Q

Origin of Infraspinatus

A

Infraspinous fossa of the scapula

79
Q

Origin of Trapezius

A

Medial 1/3 of superior nuchal line, external occipital protuberance, nuchal ligament, spinous processes C7-T12

80
Q

Origin of Triceps Brachii

A

Long Head: Infraglenoid tubercle of the scapula Lateral Head: Posterior surface of humerus above radial groove Medial Head: Posterior surface of humerus below radial groove

Clinical Anatomy (7 decks)

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