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Anatomy 2- Practical Exam > Muscles of the Shoulder > Flashcards

Muscles of the Shoulder Flashcards

1
Q

Attachments of deltoid

A

O: anterior fibres - anterior border lateral 1/3rd clavicle , middle fibres - outer margins of acromion, posterior fibres - lower border of spine of scapula

I: deltoid tuberosity of humerus

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2
Q

Nerve supply of deltoid

A

Axillary nerve - C5, 6

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3
Q

Action of deltoid

A

Abduct the arm

Anterior fibres - flex and medially rotate

Posterior fibres - extend and laterally rotate

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4
Q

Function of deltoid

A

carrying bags

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5
Q

Attachments: Subscapularis

A

O: medial 2/3rd subscapular fossa

I: lesser tubercle of humerus & the capsule

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6
Q

Action of subscapularis

A

Strong medial rotator

Assists Adduction

Holds humeral head in glenoid fossa

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7
Q

Function of subscapularis

A

Scratching back

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8
Q

Nerve supply: Subscapularis

A

upper and lower subscapular nerves C5,6,7

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9
Q

Attachments: Supraspinatus

A

O: medial 2/3rds supraspinous fossa

I: deep surface blends with JC, then inserts to UPPER facet of GREATER tubercle

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10
Q

Nerve supply: Supraspinatus

A

Suprascapular nerve (C5, 6)

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11
Q

Action of supraspinatus

A

Initiation of abduction Braces humeral head in glenoid fossa

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12
Q

function of supraspinatus

A

side reaching

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13
Q

Attachments of Teres Minor

A

O: upper 2/3rd of lateral border of scapula

I: inferior facet on greater tubercle of humerus

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14
Q

Nerve supply: Teres Minor

A

Axillary Nerve

C5, 6

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15
Q

Action of teres minor

A

Reinforces lower JC

Lateral rotation - in anatomical position

In abduction - Lateral rotation and adduction

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16
Q

Function of teres minor

A

brushing hair

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17
Q

Attachments of infraspinatus

A

O: medial 2/3rds infraspinous fossa

I: middle fact on greater tubercle of humerus and posterior JC

18
Q

Nerve supply of infraspinatus

A

suprascapular nerve C5, 6

19
Q

Action of infraspinatus

A

lateral rotation

20
Q

function of infraspinatus

A

brushing hair

21
Q

Attachments of serratus anterior

A

O: outer surfaces of upper 8 or 9 ribs and intercostal fascia

I: costal surface of medial border of scapula

22
Q

Nerve supply of serratus anterior

A

long thoracic nerve C5, 6, 7

23
Q

action of serratus anterior

A

protraction and lateral rotation of the scapula

24
Q

function of serratus anterior

A

punching

25
Q

attachments of pectoralis major

A

O: medial 1/2 anterior border of clavicle, anterior surface of clavicle and anterior surface of upper 6 CCs, 6th rib

I: lateral lip of bicipital groove

26
Q

Nerve supply of pectoralis major

A

medial and lateral pectoral nerves C5-T1

27
Q

Action of pectoralis major

A

flexes, medially rotates and addicts the arm

28
Q

function of pectoralis major

A

punching

29
Q

attachments of coracobrachialis

A

O: apex of coracoid process

I: medial side of shaft of humerus

30
Q

nerve supply to coracobrachialis

A

musculocutaneous nerve C6 and C7

31
Q

action of coracobrachialis

A

adducts and flexes the arm

32
Q

function of coracobrachialis

A

gripping object to trunk

33
Q

attachments of lattisimus dorsi

A

O:

  • via thoracolumbar fascia to spinous processes of T7-12,
  • all lumbar and sacral vertebrae,
  • supraspinous and interspinous ligaments, - posterior outer lip of iliac crest,
  • lower 4 ribs
  • inferior angle of scapula

I: via long flat tendon with 180 degree twist to floor of bicipital groove of humerus

34
Q

Nerve supply of lattisimus dorsi

A

thoracodorsal nerve C6, 7, 8

35
Q

Action of lattisimus dorsi

A

adducts, medially rotates and extends the arms

36
Q

function of lattisimus dorsi

A

pushing up out of a chair

37
Q

attachments of teres major

A

O: lower third lateral border and inferior angle of scapula

I: medial lip of intertubecular groove of humerus

38
Q

nerve supple of teres major

A

lower subscapular nerve C6, 7

39
Q

action of teres major

A

adducts and medial rotation

40
Q

function of teres major

A

scratching back

Anatomy 2- Practical Exam (17 decks)

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