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Upper Limb > Muscles of Shoulder & Arm > Flashcards

Muscles of Shoulder & Arm Flashcards

1
Q

What muscles attach the pectoral girdle to the trunk from the thoracic wall?

A

pec major, pec minor, subclavius, serratus anterior

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2
Q

What muscles attach the pectoral girdle to the trunk from the vertebral column?

A

trapezius, lat dorsi, rhomboid major, rhomboid minor, levator scapulae

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3
Q

What is the origin and insertion of pec major?

A

clavicular and sternocostal head with an insertion on proximal humerus

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4
Q

What is the action of pec major?

A

adduction and medial rotation of the upper limb and an accessory muscle of respiration if the humerus is fixed

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5
Q

What is the origin and insertion of pec minor?

A

costal cartiage or ribs 3,4,5 and inserts on the coracoid process

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6
Q

What is the action of pec minor?

A

stabilises scapula and depresses the shoulder an an accessory muscle of inspiration

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7
Q

What is the origin and insertion of subclavius?

A

origin on the anteromedial part of first rib and insertion on the lateral inferior surface of the clavicle

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8
Q

What is action of subclavius?

A

stabilises clavicle and depresses shoulder

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9
Q

What is the origin and insertion of serratus anterior?

A

saw tooth attachment on ribs 1-8 and inserts on the medial border of the scapula

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10
Q

What is the action of serratus anterior?

A

reaching forward - allows scapula to travel around chest wall - boxers muscle

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11
Q

What is the nerve supply of serratus anterior?

A

long thoracic nerve

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12
Q

What do you see in a patient with a damaged long thoracic nerve?

A

winged scapula

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13
Q

What muscles attach the humerus to the scapula?

A

deltoid, subscapularis, supraspinatus, infraspinatus, teres minor, teres major

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14
Q

What is the origin and insertion of deltoid?

A

origin the spine of the scapula, the acromion process and the clavicle and inserts on the deltoid tubercle on the humerus

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15
Q

What is the action of deltoid?

A

powerful abducter - but can’t initiate abduction - also flexion and extension

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16
Q

What are the muscles of the rotator cuff?

A

supraspinatus, infraspinatus, subscapularis and teres minor

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17
Q

What is the feature of all muscles of the rotator cuff?

A

they blend with the capsule of the shoulder joint

18
Q

Where do supraspinatus, infraspinatus and teres minor all insert?

A

on the greater tubercle of the humerus

19
Q

What is the action of supraspinatus?

A

initiates abduction

20
Q

What is the action of infraspinatus and teres minor?

A

lateral rotation

21
Q

What is the insertion of subscapularis?

A

lesser tubercle of the humerus

22
Q

What is the action of subscapularis?

A

medial rotator

23
Q

From what muscle is teres major derived?

A

subscapularis

24
Q

What is the origin of teres major?

A

inferior angle of the scapula

25
Q

What is the action of teres major?

A

abducts and medially rotates

26
Q

What are the muscles of the anterior compartment of the arm?

A

biceps brachii, coracobrachialis, brachialis

27
Q

What is the origin of the long head of biceps?

A

supraglenoid tubercle

28
Q

What is the origin of the short head of biceps?

A

coracoid process

29
Q

What is the insertion of biceps tendon?

A

radial tuberosity

30
Q

What is the action of biceps brachii?

A

flexion at the elbow and supination when elbow is flexed

31
Q

What is the origin of brachialis?

A

distal half of shaft of the humerus

32
Q

What is the insertion of brachialis?

A

coranoid process of the ulna

33
Q

What is the action of brachialis?

A

flexion at the elbow

34
Q

What is the origin of coracobrachialis?

A

coracoid process

35
Q

What is the insertion of coracobrachialis?

A

shaft of the mid humerus

36
Q

What is the action of coracobrachialis?

A

flexion and adduction at the shoulder

37
Q

What is the origin of the long head of triceps?

A

infraglenoid tubercle

38
Q

What is the origin of the lateral head of triceps?

A

linear origin on the proximal part of the posterior aspect of humerus

39
Q

What is the origin of the medial (deep) head of triceps?

A

clothes the posterior aspect of the shaft of humerus

40
Q

What is the insertion of triceps?

A

olecranon of the ulna

41
Q

What is the action of triceps?

A

extension at the elbow

Upper Limb (9 decks)

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