Shoulder Region

Question 1

Deltoid Origin
anterior fibers
middle fibers
posterior fibers

Answer 1

clavicle
aromion os scapula
crest of spine of scapula

Question 2

Insertion of deltoid

Answer 2

into deltoid tuberosity on humerus

Question 3

nerve supply of deltoid

Answer 3

circumflex/axillary artery C5,6

Question 4

action of deltoid

Answer 4

anterior fibres - flex and medially rotate arm
posterior fibres - extend and laterally rotate arm
middle fibres - abduct arm from 15 to 90 degrees

Question 5

paralysis of deltoid

Answer 5

flat shoulder and loss of abduction from 15 to 90 degrees

Question 6

supraspinatus origin

Answer 6

supraspinous fossa of scapula

Question 7

supraspinatus insertion

Answer 7

into highest impression of greater tuberosity on humerus

Question 8

nerve supply of supraspinatus

Answer 8

suprascapular nerve (C5,C6)

Question 9

action of supraspinatus

Answer 9

1. helps steady head of humerus into glenoid cavity

2. abducts arm from 0 to 15 degrees (activates abduction)

Question 10

infraspinatus origin

Answer 10

infraspinous fossa of scapula

Question 11

infraspinatus insertion

Answer 11

in middle impression on back of greater tuberosity of humerus

Question 12

infraspinous nerve supply

Answer 12

same as supra
suprascapular nerve (C5,C6)

Question 13

infrascapular action

Answer 13

1. steadies head of humerus

2. rotates arm laterally

Question 14

rotator cuff muscles

Answer 14

supraspinatus, infraspinatus, teres minor, subscapularis

Question 15

teres minor origin

Answer 15

upper part of scapula

Question 16

teres minor insertion

Answer 16

lowest impression on back of greater tuberosity of humerus

Question 17

teres minor nerve supply

Answer 17

axillary/circumflex nerve (C5,C6)

Question 18

teres minor action

Answer 18

1. steadies head of humerus

2. adducts and laterally rotates arm

Question 19

teres major origin

Answer 19

lower part of scapula

Question 20

teres major insertion

Answer 20

medial lip of biccipital groove of humerus

Question 21

teres major nerve supply

Answer 21

lower subscapular nerve (C5,6)

Question 22

action of teres major

Answer 22

adduction, medial rotation, and extention of arm

Question 23

subscapularis origin

Answer 23

subscapular fossa

Question 24

subscapularis insertion

Answer 24

lesser tuberosity of humerus

Question 25

subscapular nerve supply

Answer 25

upper & lower subscapular nerves (C5,6)

Question 26

subscapularis action

Answer 26

1. stabilization of anterior shoulder joint

2. medial rotation and adduction of arm

Question 27

serratus anterior origin

Answer 27

upper 8 ribs

first digitation if largest and arises from first and second ribs

Question 28

insertion of serratus anterior
first digitation
2nd and 3rd
lower 5

Answer 28

in medial border of scapula
first digitation - superior angle
2nd and 3rd- medial border
lower 5- inferior angle

Question 29

serratus anterior nerve supply

Answer 29

nerve to serratus anterior (long thoracic nerve) C5,6,7

Question 30

serratus anterior action

Answer 30

1. main protractor of the shoulder by drawing scapula forward
2. acts w/ upper and lower fibres of trapezius to rotate scapula so glenoid cavity looks upward
3. helps fix scapula to chest wall
4. pull on ribs in forces inspiration

Question 31

paralysis of serratus anterior

Answer 31

winging of scapula

Question 32

quadrangular space boundaries

Answer 32

above: teres minor, subscapularis, capsule of shoulder joint
below: teres major
medially: long head of triceps
laterally: humerus

Question 33

quadrangular space contents (what passes through it)

Answer 33

1. posterior circumflex humeral vessels

2. axillary/circumflex nerve

Question 34

upper triangular space boundries

Answer 34

above: teres minor and subscapularis
below: teres major
lateral: long head of triceps

Question 35

contents of upper triangular space

Answer 35

transmits only circumflex scapular artery

Question 36

lower triangular space boundaries

Answer 36

above: teres major
medal: long head of triceps
lateral: lateral head of triceps and shaft of humerus

Question 37

lower triangular space contents

Answer 37

radial nerve and profunda bracii nerve