Scapular and pectoral region

Question 1

name the muscles of the pectoral girdle (rotator cuff)

Answer 1

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

Question 2

origin of deltiod

Answer 2

lateral clavicle, acromion & spine of scapula

Question 3

insertion of deltiod

Answer 3

deltiod tuberosity of humerus

Question 4

action of deltiod

Answer 4

aducts, flexus, extends, rotates humerus

Question 5

supply of deltiod

Answer 5

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

Question 6

origin of teres major

Answer 6

inferior angle of scapula

Question 7

insertion of teres major

Answer 7

crest of lesser tubercle of humerus

Question 8

action of teres major

Answer 8

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

Question 9

supply of teres major

Answer 9

lower subscapular (C5-C6) nerve & subscapular vessels

Question 10

origin of supraspinatus

Answer 10

supraspinous fossa

Question 11

insertion of supraspinatus

Answer 11

greater tubercle of humerus

Question 12

action of supraspinatus

Answer 12

abducts humerus (only 1st 15 degrees)

Question 13

supply of supraspinatus

Answer 13

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

Question 14

origin of infraspinatus

Answer 14

infraspinous fossa

Question 15

insertion of infraspinatus

Answer 15

greater tubercle of humerus

Question 16

action of infraspinatus

Answer 16

lateral rotation of humerus

Question 17

supply of infraspinatus

Answer 17

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

Question 18

origin of teres minor

Answer 18

lateral border of scapula

Question 19

insertion of teres minor

Answer 19

greater tubercle of humerus

Question 20

action of teres minor

Answer 20

lateral rotation of humerus (w/ infraspinatus)

Question 21

supply of teres minor

Answer 21

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

Question 22

origin of subscapularis

Answer 22

subscapular fossa

Question 23

insertion of subscapularis

Answer 23

lesser tubercle of humerus

Question 24

action of subscapularis

Answer 24

medial rotation of humerus

Question 25

supply of subscapularis

Answer 25

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

Question 26

what are the spaces of the shoulder region?

Answer 26

quadrangular space, triangular space, triangular interval

Question 27

what does the quadrangular space transmit?

Answer 27

axillary nerve, posterior circumflex humeral artery

Question 28

what lies beneath the triangular space?

Answer 28

circumflex scapular artery (deep to space)

Question 29

what does the triangular interval transmit?

Answer 29

profunda brachii (deep brachial artery), radial nerve

Question 30

boundaries of the quadrangular space

Answer 30

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

Question 31

boundaries of triangular space

Answer 31

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

Question 32

boundaries of triangular interval

Answer 32

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

Question 33

which 2 main arteries give collateral circulation to scapular region?

Answer 33

thyrocervical trunk and subscapular artery

Question 34

origin of pectoralis major

Answer 34

clavicle, sternum & ribs 2-6

Question 35

insertion of pectoralis major

Answer 35

crest of greater tubercle of humerus

Question 36

action of pectoralis major

Answer 36

adducts & medially rotates humerus

Question 37

supply of pectoralis major

Answer 37

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

Question 38

origin of pectoralis minor

Answer 38

ribs 3-5

Question 39

insertion of pectoralis minor

Answer 39

coracoid process of scapula

Question 40

action of pectoralis minor

Answer 40

protracts scapula

Question 41

supply of pectoralis minor

Answer 41

Medial pectoral nerve (C8 & T1), thoracoacromial vessels

Question 42

arterial supply of pectoral region

Answer 42

lateral and internal thoracic arteries (mammary), thoracoacromial artery

Question 43

what does the lateral thoracic artery supply?

Answer 43

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

Question 44

what does the internal thoracic artery supply?

Answer 44

anterior thorax, medial pectoral region, medial breast

Question 45

what are the branches of the thoracoacromial artery?

Answer 45

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

Question 46

what are the general sensory nerves to Pec region?

Answer 46

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

Question 47

the medial pectoral nerve

Answer 47

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

Question 48

Lateral pectoral nerve

Answer 48

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

Question 49

long thoracic nerve

Answer 49

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