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Question 1

what is the origin of the pectoralis major muscle?

Answer 1

clavicular: sternal end of clavicle
steronocostal: sternum

Question 2

What is the insertion of the pectoralis major?

Answer 2

clavicular and sternocosal: greater tubercle of anterior humerus

Question 3

What is the peripheral and segmental innervation of the pectoralis major?

Answer 3

Clavicular: lateral pectoral 5,6,7
Sternocostal: lateral and medial pectoral 6,7,8,T1

Question 4

What is the action of the pectoralis major?

Answer 4

Flex, medially rotate, and adduction
clavicular: flex, med rot, horizontally adduct
sternocostal: oblique adduction and depresses shoulder

Question 5

Origin of latissimus dorsi

Answer 5

T7 - L5, ilium and sacrum

Question 6

Insertion of latissimus dorsi

Answer 6

Intertubercular groove of anterior humerus

Question 7

Nerve innervation of latissimus dorsi

Answer 7

thorasodorsal 6,7,8

Question 8

Action of latissimus dorsi

Answer 8

extend, med rot, and adduct (respiratory muscle)

Question 9

Origin of deltoid muscle

Answer 9

anterior: acromion and clavicle
middle: acromion
posterior: spine of scapula

Question 10

Insertion of deltoid muscle

Answer 10

deltoid tuberosity

Question 11

Action of deltoid

Answer 11

abduct humerus
anterior: flexion and medially rotate
middle: abduction
posterior: extend, laterally rotate and horizontal abduction

Question 12

Nerve innervation for deltoid muscle

Answer 12

Axillary - C5,6

Question 13

Origin for Teres Major

Answer 13

Inferior angle of scapula

Question 14

Insertion for Teres Major

Answer 14

intertubercle groove of humerus

Question 15

Action for Teres Major

Answer 15

Extend, med rot, adduct
stabilizes head of humerus in glenoid cavity

Question 16

Nerve innervation for Teres Major

Answer 16

Upper and Lower Subscapular 5,6,7

Question 17

Origin for Supraspinatus

Answer 17

supraglenoid fossa of scapula

Question 18

Insertion for Supraspinatus

Answer 18

greater tubercle of proximal humerus

Question 19

Action for Supraspinatus

Answer 19

Abducts
stabilizes head of humerus in glenoid cavity

Question 20

Nerve innervation for supraspinatus

Answer 20

suprascapular 4,5,6

Question 21

origin for infraspinatus

Answer 21

infraspinatus fossa of scapula

Question 22

insertion for infraspinatus

Answer 22

greater tubercle for proximal humerus

Question 23

nerve innervation for infraspinatus

Answer 23

suprascapular 4,5,6

Question 24

action for infraspinatus

Answer 24

laterally rotates
stabilizes head of humerus in glenoid cavity

Question 25

origin for subscapularis

Answer 25

subscapularis fossa of scapula

Question 26

insertion for subscapularis

Answer 26

lesser tubercle of humerus

Question 27

nerve innervation for subscapularis

Answer 27

upper and lower subscapular 5,6,7

Question 28

action for subscapular

Answer 28

medially rotates stabilizes head of humerus in glenoid cavity

Question 29

origin for teres minor

Answer 29

dorsal lateral angle of scapula

Question 30

insertion for teres minor

Answer 30

inferior portion of greater tubercle of proximal humerus

Question 31

nerve innervation for teres minor

Answer 31

axillary 5,6

Question 32

action for teres minor

Answer 32

laterally rotate stabilizes head of humerus in glenoid cavity Internally rotates scapula

Question 33

origin for pectoralis minor

Answer 33

3,4,5 rib

Question 34

insertion for pectoralis minor

Answer 34

coracoid process of scapula

Question 35

action for pectoralis minor

Answer 35

depression, downward rotation and abduction of scapula elevation of ribs

Question 36

nerve innervation for pectoralis minor

Answer 36

medial pectoral C6,7,8,T1

Question 37

origin for serratus anterior

Answer 37

8-9 ribs

Question 38

insertion for serratus anterior

Answer 38

anterior medial scapula

Question 39

action for serratus anterior

Answer 39

depression, abduction, upward rotation prevents scapula winging via ext. rotation

Question 40

nerve innervation for serratus anterior

Answer 40

long thoracic nerve 5,6,7,8

Question 41

origin for trapezius

Answer 41

upper: occipital bone middle:T1-5 lower:T6-12

Question 42

insertion for trapezius

Answer 42

inferior clavicle and acromion spine of scapula

Question 43

action for trapezius

Answer 43

upper:elevation and upward rotation of scapula middle:adduction of scapula lower:depression of scapula and upward rotation of scapula

Question 44

nerve innervation for trapezius

Answer 44

ventral ramus C2,3,4

Question 45

origin for rhomboids minor

Answer 45

C7-T1

Question 46

insertion for rhomboids minor

Answer 46

posterior medial border of scapula

Question 47

action of rhomboids minor

Answer 47

adduct scapula +externally and downward rotate scapula

Question 48

nerve innervation for rhomboids minor

Answer 48

dorsal scapula 4,5

Question 49

origin for leveator scapulae

Answer 49

C1-4

Question 50

insertion for levator scapula

Answer 50

posterior superior border of scapula

Question 51

origin for subclavius

Answer 51

1st rib

Question 52

insertion for subclavius

Answer 52

inferior clavicle

Question 53

nerve innervation for subclavius

Answer 53

subclavian nerve 5,6

Question 54

action for subclavius

Answer 54

keeps scapula down stabilizes sternoclavicular ligament

Question 55

origins for rhomboids major

Answer 55

T2-T5

Question 56

insertion for rhomboids major

Answer 56

posterior medial scapula

Question 57

nerve innervation for rhomboids major

Answer 57

dorsalscapular 4,5