Muscles Of The Shoulder

Front 1

biceps brachii
-action

Back 1

flexes the elbow and the arm; supinates the forearm

Front 2

biceps brachii
- origin

Back 2

-long head: supragleniod tuberosity of the scapula
-short head: coracoid process of the scapula

Front 3

bicpes
- insertion

Back 3

tuberosity of the radius

Front 4

triceps
-action

Back 4

extends the elbow and the arm
stabilizes shoulder joint

Front 5

triceps
-origin

Back 5

-long head: infraglenoid tuberosity of the scapula
-lateral head: posterior surface of the humerus above the radial groove
-medial head: posterior surface of the humerus below the radial groove

Front 6

triceps
-insertion

Back 6

olecranon process of the ulna

Front 7

deltiod
-action

Back 7

abducts arm: anterior fibers flex and medially rotate the arm: posterior fibers extend and laterally the arm

Front 8

deltiod
-origin

Back 8

lateral 3rd of the clavicle, the acromium process, and the spine of the scapula
(on top of the shoulder)

Front 9

deltiod
-insertion

Back 9

deltiod tuberosity of the humerus

Front 10

pectoralis major
-action

Back 10

flexes, adducts, and medially rotates the arm

Front 11

pectoralis major
-origin

Back 11

medial half of the clavicle, the sternum, the costal cartilidge of the upper 6 ribs, and the aponeurosis of the external oblique muscle

Front 12

pectoralis major
-insertion

Back 12

greater tubericle of the humerus

Front 13

latissimus dorsi
-action

Back 13

extends, adducts, and medially rotates the arm: pulls shoulder downward

Front 14

latissimus dorsi
-origin

Back 14

spinous process of the lower 6 thoracic and the lumbar vertebrea,the sacrum, the posterior illiac crest-all vial the lumbodorsal fascia

Front 15

latissimus dorsi
- insertion

Back 15

medial margin of the intertuberclar groove of the humerus

Front 16

teres minor
-action

Back 16

adducts, extends, and medially rotates the arm

Front 17

teres minor
- origin

Back 17

dorsal surface of the inferior angle of the scapula

Front 18

teres minor
-insertion

Back 18

lesser tubercle of the humerus

Front 19

supraspinatus
- action

Back 19

abducts the arm;slight lateral rotation

Front 20

supraspinatus
-origin

Back 20

supraspinatus fossa of the scapula

Front 21

supraspinatus
-insertion

Back 21

greater tubercle of the humerus

Front 22

subscapularis
-action

Back 22

rotates arm medially

Front 23

subscapularis
-origin

Back 23

subscapular fossa of the scapula

Front 24

subscapularis
-insertion

Back 24

lesser tubercle of the humerus

Front 25

infraspinatus
-action

Back 25

rotates the arm laterally; slight aduction

Front 26

infraspinatus
-origin

Back 26

infraspinatus fossa of the scapula

Front 27

infraspinatus
-insertion

Back 27

greater tubercle
(posterior to the supraspinatus)

Front 28

teres minor
-action

Back 28

rotates arm laterally

Front 29

teres minor
- origin

Back 29

axillary border of the scapula

Front 30

teres minor
-inerstion

Back 30

greater tubercle
(posterior to the infraspinatus)

Front 31

trapezius
-action

Back 31

elevates or depresses, rotates, adducts and stablizes the scapula

Front 32

trapezius
-origin

Back 32

occipital bone ligamentum nuchae, and the spinous process of the 7th cervical and all the thoracic vertebrae

Front 33

trapezius
-insertion

Back 33

lateral 3rd of the clavicle, the acromium process and the spine of the process

Front 34

rhomboideus major
-action

Back 34

adduct,stabilize, and rotate the scapula, lowering its lateral angle

Front 35

rhomboideus major
-origin

Back 35

spinous process of the 7th cervical and the first thoracic vertebrae

Front 36

rhomboideus major
-insertion

Back 36

vertebreal border of the scapula, below the spine of the scapula

Front 37

rhomboideus minor
-action

Back 37

adduct, stabilize, rotates the scapula, lowering its laterla angle

Front 38

rhomboideus minor
-origin

Back 38

spinous process of the 2nd through the fifth thoracic vertebrae

Front 39

rhomboideus minor
-insertion

Back 39

vertebral border of the scapula at the base of the spine of the scapula

Front 40

levator scapulae
-origin

Back 40

teransverse process of the upper 4 cervical vertebrae

Front 41

levator scapulae
-action

Back 41

elevates scapula and bends the neck laterally when the scapula is fixed

Front 42

levator scapulae
-insertion

Back 42

vertebral border of the scapula above the spine of the scapula

Front 43

serratus anterior
-action

Back 43

stabilizes, abducts, and rotates the scapula

Front 44

serratus anterior
-origin

Back 44

outer surface of the first 9 ribs

Front 45

serratus anterior
-insertion

Back 45

entire length of the ventral surface of he vertebral border of the scapula

Front 46

pectoralis minor
-action

Back 46

draws the scapula anteriorly and downward

Front 47

pectoralis minor
- origin

Back 47

anterior surface of the 3rd through the fifth ribs

Front 48

pectoralis minor
- insertion

Back 48

coracoid process of the scapula