Shoulder Muscles

Question 1

Deltoid Origin

Answer 1

Lateral third of anterior clavicle
lateral acromion
inferior edge of spine of scapula

Question 2

deltoid insertion

Answer 2

deltoid tuberosity of humerus

Question 3

action of deltoid

Answer 3

Clavicular:Flexes
and medially
rotates,
Acrominal:abducts
arm beyond intial 15
degrees done by
supraspinatus
Spinal:Extends and
laterally rotates arm

Question 4

Pectoralis Major Origin

Answer 4

Sternal half of
clavicle,
sternum
to 7th rib,

cartilages of true
ribs, aponeurosis
of external
oblique

Question 5

pectoralis major insertion

Answer 5

Lateral lip of
intertubercle
sulcus of
humerus

Question 6

action of pectoralis major

Answer 6

Flexes and adducts
arm, rotates arm
medially

Question 7

pectoralis minor origin

Answer 7

Outer surface of
upper margin of
ribs 3-5

Question 8

pectoralis minor insertion

Answer 8

coracoid process of scapula

Question 9

pectoralis minor action

Answer 9

Lowers lateral angle
of scapula and
protracts scapula

Question 10

subclavius origin

Answer 10

upper boarder of
1st rib and its
cartilage

Question 11

subclavius insertion

Answer 11

inferior
surface of
middle third
of clavicle

Question 12

subclavius action

Answer 12

anchors and depresses the clavicle

Question 13

trapezius origin

Answer 13

superior nuchal
line, external
occipital
proturberance,
nuchal ligament,
spinous
processes of C7-
T12

Question 14

trapezius insertion

Answer 14

Lateral third
of clavicle,
acromion,
and spine of
scapula

Question 15

trapezius action

Answer 15

elevates, retracts, and rotates scapula, lower fibers depress scapula

Question 16

latissimus dorsi origin

Answer 16

spinous process of T7-L5
throacolumbar fascia
iliac crest
last 3 ribs

Question 17

latissimus dorsi insertion

Answer 17

intertubercle sulcus of humerus

Question 18

latissimus dorsi action

Answer 18

extends, adducts, medially rotates humerus at shoulder

Question 19

rhomboid major origin

Answer 19

spinous process of T2-T5

Question 20

rhomboid major insertion

Answer 20

medial boarder of scapula below base of spine of scapula

Question 21

rhomboid major action

Answer 21

fixes scapula to
thoracic wall and
retracts and rotates
it to depress glenoid
cavity

Question 22

rhomboid minor origin

Answer 22

Ligamentum
nuchae, Spines of
C7 and T1

Question 23

rhomboid minor insertion

Answer 23

Medial
boarder of
scapula at
spine of
scapula

Question 24

rhomboid minor action

Answer 24

fixes scapula to
thoracic wall and
retracts and rotates
it to depress glenoid
cavity

Question 25

serratus anterior origin

Answer 25

lateral surfaces of upper 8-9 ribs

Question 26

serratus anterior insertion

Answer 26

``` costal surface of medial boarder of scapula ```

Question 27

serratus anterior action

Answer 27

Protracts and rotates scapula and holds it against thoracic wall

Question 28

levator scapulae origin

Answer 28

``` posterior tubercule of trasverse processes of C1- C4 ```

Question 29

levator scapulae insertion

Answer 29

``` Medial border of scapula from superior angle to spine ```

Question 30

levator scapulae action

Answer 30

elevates scapula medially, inferiorly rotates glenoid cavity

Question 31

supraspinatus origin

Answer 31

supraspinous fossa of scapula and deep fascia

Question 32

supraspinatus insertion

Answer 32

``` superior facet of greater tubercle of humerus ```

Question 33

supraspinatus action

Answer 33

initiates arm abduction, acts with rotator cuff muscles

Question 34

infraspinatus origin

Answer 34

Infraspinous fossa of scapula and deep fascia

Question 35

infraspinatus insertion

Answer 35

Middle Facet of greater tubercle of humerus

Question 36

infraspinatus action

Answer 36

Lateral Rotation of arm(with teres minor)

Question 37

teres major origin

Answer 37

Posterior surface of inferior angle of scapula

Question 38

teres major insertion

Answer 38

medial lip of intertubercle sulcus of humerus

Question 39

teres major action

Answer 39

adducts and | medially rotates arm

Question 40

teres minor origin

Answer 40

Upper 2/3 of posterior surface of lateral border of scapula

Question 41

teres minor insertion

Answer 41

inferior facet of greater tubercle of humerus

Question 42

teres minor action

Answer 42

laterally rotates arm

Question 43

subscapularis origin

Answer 43

subscapular fossa

Question 44

subscapularis insertion

Answer 44

lesser tuberacle of humerus

Question 45

subscapularis action

Answer 45

``` medially rotates arm at shoulder and adducts it, helps hld humeral head in glenoid cavity ```

Question 46

biceps brachii origin

Answer 46

``` Long head: supraglenoid tubercle of scapula Short Head:tip of coracoid process of scapula ```

Question 47

biceps brachii insertion

Answer 47

``` Radial tuberosity, fascia of forearm via bicipital aponeurosis ```

Question 48

biceps brachii action

Answer 48

flexes and supinates | forearm at elbow

Question 49

brachialis origin

Answer 49

Distal half of anterior surface of humerus

Question 50

brachialis insertion

Answer 50

coronoid process and tuberosity of ulna

Question 51

brachialis action

Answer 51

flexes forearm at the elbow

Question 52

coracobrachialis origin

Answer 52

tip or coracoid process of scapula

Question 53

coracobrachialis insertion

Answer 53

middle third of medial surface of humerus

Question 54

coracobrachialis action

Answer 54

flexes and adducts arm at shoulder

Question 55

triceps brachii origin

Answer 55

``` Long Head: infraglenoid tubercle of scapula Lateral head: upper half of posterior humerus medial head: distal 2/3 of medial and posterior humerus ```

Question 56

triceps brachii insertion

Answer 56

``` posterior surface of olecranon process of ulna ```

Question 57

triceps brachii action

Answer 57

``` extends forearm at elbow, long head stabilizes head of abducted humerus and extends and adducts arm at shoulder ```