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anatomy final- muscles > Scapular and pectoral region > Flashcards

Scapular and pectoral region Flashcards

1
Q

name the muscles of the pectoral girdle (rotator cuff)

A

deltiod, teres major and minor, supraspinitus, infraspinitus, subscapularis (SITS mnemonic for rotator cuff)

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2
Q

origin of deltiod

A

lateral clavicle, acromion & spine of scapula

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3
Q

insertion of deltiod

A

deltiod tuberosity of humerus

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4
Q

action of deltiod

A

aducts, flexus, extends, rotates humerus

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5
Q

supply of deltiod

A

axillary nerve (C5, C6) and POSTERIOR circumflex humeral vessels

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6
Q

origin of teres major

A

inferior angle of scapula

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7
Q

insertion of teres major

A

crest of lesser tubercle of humerus

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8
Q

action of teres major

A

adducts, extends & medially rotates humerus (traps “little helper)

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9
Q

supply of teres major

A

lower subscapular (C5-C6) nerve & subscapular vessels

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10
Q

origin of supraspinatus

A

supraspinous fossa

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11
Q

insertion of supraspinatus

A

greater tubercle of humerus

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12
Q

action of supraspinatus

A

abducts humerus (only 1st 15 degrees)

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13
Q

supply of supraspinatus

A

suprascapular nerves (C5-6) & vessels, dorsal scapular vessels

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14
Q

origin of infraspinatus

A

infraspinous fossa

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15
Q

insertion of infraspinatus

A

greater tubercle of humerus

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16
Q

action of infraspinatus

A

lateral rotation of humerus

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17
Q

supply of infraspinatus

A

suprascapular nerve (C5-6) & vessels, subscapular vessels

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18
Q

origin of teres minor

A

lateral border of scapula

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19
Q

insertion of teres minor

A

greater tubercle of humerus

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20
Q

action of teres minor

A

lateral rotation of humerus (w/ infraspinatus)

21
Q

supply of teres minor

A

axillary nerve & suprascapular (both C5-6) & subscapular vessels

22
Q

origin of subscapularis

A

subscapular fossa

23
Q

insertion of subscapularis

A

lesser tubercle of humerus

24
Q

action of subscapularis

A

medial rotation of humerus

25
Q

supply of subscapularis

A

upper & lower subscapular nerves (C5-6), subscapular vessels

26
Q

what are the spaces of the shoulder region?

A

quadrangular space, triangular space, triangular interval

27
Q

what does the quadrangular space transmit?

A

axillary nerve, posterior circumflex humeral artery

28
Q

what lies beneath the triangular space?

A

circumflex scapular artery (deep to space)

29
Q

what does the triangular interval transmit?

A

profunda brachii (deep brachial artery), radial nerve

30
Q

boundaries of the quadrangular space

A

teres minor- superior, teres major- inferior, long head of triceps- medial, “Surgical neck” of humerus- lateral

31
Q

boundaries of triangular space

A

teres minor- superior, teres major- inferior, long head of triceps- LATERAL

32
Q

boundaries of triangular interval

A

teres major- superior, long head of triceps- medial, lateral head of triceps- lateral

33
Q

which 2 main arteries give collateral circulation to scapular region?

A

thyrocervical trunk and subscapular artery

34
Q

origin of pectoralis major

A

clavicle, sternum & ribs 2-6

35
Q

insertion of pectoralis major

A

crest of greater tubercle of humerus

36
Q

action of pectoralis major

A

adducts & medially rotates humerus

37
Q

supply of pectoralis major

A

medial AND lateral pectoral nerve (C5-6, C8-T1), thoracoacromial vessels

38
Q

origin of pectoralis minor

A

ribs 3-5

39
Q

insertion of pectoralis minor

A

coracoid process of scapula

40
Q

action of pectoralis minor

A

protracts scapula

41
Q

supply of pectoralis minor

A

Medial pectoral nerve (C8 & T1), thoracoacromial vessels

42
Q

arterial supply of pectoral region

A

lateral and internal thoracic arteries (mammary), thoracoacromial artery

43
Q

what does the lateral thoracic artery supply?

A

supplies lateral thorax (shocking, I know), serratus anterior, lateral pec region, lateral breast

44
Q

what does the internal thoracic artery supply?

A

anterior thorax, medial pectoral region, medial breast

45
Q

what are the branches of the thoracoacromial artery?

A

Pectoral, clavicular, acromial, deltiod (Cadavers Are Dead People mneumonic)

46
Q

what are the general sensory nerves to Pec region?

A

T1-T6, lateral and anterior cutaneous branches of intercostal nerves

47
Q

the medial pectoral nerve

A

medial chord of brachial plexus, from ventral rami (C8-t1), pierces pec minor to get to pec major, supplies pec minor & part of pec major

48
Q

Lateral pectoral nerve

A

lateral cord of brachial plexus, from ventral rami (c5-7), runs above pec minor, enters pec major

49
Q

long thoracic nerve

A

from ventral rami (c5-7) like lat pec nerve, supplies serratus ant, damage gives winged scapula

anatomy final- muscles (2 decks)

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