Hmti Muscle A,o,i Back, Shoulder, Arm Unit 3

Front 1

Teres major

Back 1

Complete synergist with latissimus dorsi

Front 2

Deltoid origin

Back 2

Lateral third of clavicle

Acromion

Spine of scapula

Front 3

Deltoid actions

Back 3

All fibers- abduct shoulder (glenohumeral joint)

Anterior fibers- flex shoulder (g/h joint)

Medially rotate shoulder

Horizontally adduct shoulder

Posterior fibers- extend shoulder

Laterally rotate shoulder

Horizontally abduct shoulder

Front 4

Trapezius

Back 4

Front 5

Deltoid insertion

Back 5

Deltoid tuberosity

Front 6

Trapezius insertion

Back 6

Lateral third of clavicle

Acromion

Spine of scapula

Front 7

Latissimus dorsi actions

Back 7

Extends, adducts, medially rotates shoulder (g/h)

Front 8

Trapezius actions

Back 8

Upper fibers-

Bilaterally- extend head and neck

Unilaterally- lateral flex head and neck to same side

Rotate head and neck to opposite side

Elevate scapula (scapulothoracic joint)

Upwardly rotate scapula (s/t joint)

Middle fibers- adduct scapula

Stabilize scapula

Lower fibers- depress scapula

Upwardly rotate scapula

Front 9

Trapezius origin

Back 9

External occipital protuberance

Medial portion of superior nuchal line of occiput

Ligamentum nuchae

Spinous processes of C7- T12

Front 10

Latissimus dorsi

Back 10

Can also affect trunk and spine

Contraction of left lat assists in lateral flexion of spine to the left

Front 11

Deltoid

Back 11

Front 12

Teres major actions

Back 12

Extend, adduct, medially rotates shoulder

Front 13

Teres major origin

Back 13

Inferior angle and lower third of lateral border of scapula

Front 14

Teres major insertion

Back 14

Crest of lesser tubercle of humerus

Front 15

Latissimus dorsi insertion

Back 15

Intertubercular groove of humerus

Front 16

Latissimus dorsi origin

Back 16

Inferior angle of scapula

Spinous processes of last 6 Thoracic vertebrae, last 3 or 4 ribs

Thoracolumbar aponeurosis

Posterior iliac crest

Front 17

Rotator cuff muscles

Back 17

Supraspinatus

Infraspinatus

Teres minor

Subscapularis

Front 18

Supraspinatus

Back 18

Assist deltoid with abduction of shoulder

Only RC muscle not involved in shoulder rotation

Front 19

Supraspinatus actions

Back 19

Abduct shoulder

Stabilize head of humerus in glenoid cavity

Front 20

Supraspinatus origin

Back 20

Supraspinous fossa of scapula

Front 21

Supraspinatus insertion

Back 21

Greater tubercle of humerus

Front 22

Infraspinatus

Back 22

Synergistic with Teres minor in lateral rotation of shoulder

Multipennate fibers

Thick superficial fascia

Front 23

Infraspinatus actions

Back 23

Laterally rotate shoulder

Adduct shoulder

Stabilize head of humerus in glenoid cavity

Front 24

Infraspinatus origin

Back 24

Infrspinous fossa of scapula

Front 25

Infraspinatus insertion

Back 25

Greater tubercle of humerus

Front 26

Teres minor

Back 26

Antagonist with Teres major in rotation of humerus

Front 27

Teres minor actions

Back 27

Laterally rotate shoulder

Adduct shoulder

Stabilize head of humerus in glenoid cavity

Front 28

Teres minor origin

Back 28

Upper 2/3 lateral border of scapula

Front 29

Teres minor insertion

Back 29

Greater tubercle of humerus

Front 30

Subscapularis

Back 30

Only RC muscle to attach to lesser tubercle of humerus

Front 31

Subscapularis actions

Back 31

Medially rotates shoulder

Stabilize head of humerus in glenoid cavity

Front 32

Subscapularis origin

Back 32

Subscapular fossa

Front 33

Subscapularis insertion

Back 33

Lesser tubercle of humerus

Front 34

Rhomboid minor

Back 34

Front 35

Rhomboid minor actions

Back 35

Adduct scapula

Elevate scapula

Downwardly rotate scapula

Front 36

Rhomboid minor origin

Back 36

Spinous processes of C7 and T1

Front 37

Rhomboid minor insertion

Back 37

Upper portion of medial border of scapula across from spine of scapula

Front 38

Rhomboid major

Back 38

Front 39

Rhomboid major actions

Back 39

Adduct scapulaElevate scapulaDownwardly rotate scapula

Front 40

Rhomboid major origin

Back 40

Spinous processes of T2-T5

Front 41

Rhomboid major insertion

Back 41

Medial border of scapula between spine of scapula and inferior angle

Front 42

Levator scapula

Back 42

Front 43

Levator scapula actions

Back 43

Unilaterally

Elevate scapula

Downwardly rotate scapula

Laterally flex head and neck

Rotate head and neck to same side

Bilaterally

Extend head and neck

Front 44

Levator scapula origin

Back 44

Transverse processes of C1-C4

Front 45

Levator scapula insertion

Back 45

Medial border of scapula between superior angle and superior portion of spine of scapula

Front 46

Serratus anterior

Back 46

Antagonist to Rhomboid- abducts scapula

Front 47

Serratus anterior actions

Back 47

With origin fixed

Abduct scapula

Upwardly rotate scapula

Depress scapula

Hold medial border of scapula against ribcage

With scapula fixed

May act to elevate thorax during forced inhalation

Front 48

Serratus anterior origin

Back 48

External surfaces of upper eight or nine ribs

Front 49

Serratus anterior insertion

Back 49

Anterior surface of medial border of scapula

Front 50

Pectoralis major

Back 50

Upper and lower fibers antagonist to each other in flexion/extension of shoulder

Front 51

Pectoralis major actions

Back 51

All fibers

Adduct shoulder

Medially rotate shoulder assist to elevate thorax during forced inhalation

Upper fibers

Flex shoulder

Horizontally adduct shoulder

Lower fibers

Extend shoulder

Front 52

Pectoralis major origin

Back 52

Medial half of clavicle, sternum and cartilage of ribs 1-6

Front 53

Pectoralis major insertion

Back 53

Crest of greater tubercle of humerus

Front 54

Pectoralis minor

Back 54

Front 55

Pectoralis minor actions

Back 55

Depress scapula

Abduct scapula

Downwardly rotate scapula

With fixed scapula

Assist to elevate thorax during forced inhalation

Front 56

Pectoralis minor origin

Back 56

Ribs 3-5

Front 57

Pectoralis minor insertion

Back 57

Medial surface of coracoid process

Front 58

Biceps brachii

Back 58

Front 59

Biceps brachii actions

Back 59

Flex elbow (humeroulnar joint)

Supinate forearm (radioulnar joint)

Flex shoulder (g/h joint)

Front 60

Biceps brachii origin

Back 60

Short head

Coracoid process

Long head

Supraglenoid tubercle of scapula

Front 61

Biceps brachii insertion

Back 61

Tuberosity of radius and aponeurosis of biceps brachii

Front 62

Triceps brachii

Back 62

Only muscle in posterior arm

Antagonist to biceps brachii

Front 63

Triceps brachii actions

Back 63

All heads

Extend elbow (h/u)

Long head

Extend shoulder (g/h)

Adduct shoulder (g/h)

Front 64

Triceps brachii origin

Back 64

Long head

Infrglenoid tubercle of scapula

Lateral head

Posterior surface of proximal half of humerus

Medial head

Posterior surface of distal half of humerus

Front 65

Triceps brachii insertion

Back 65

Olecranon process of ulna

Front 66

Coracobrachialis

Back 66

Aka arm pit muscle

Front 67

Coracobrachialis actions

Back 67

Flex shoulder

Adduct shoulder

Front 68

Coracobrachialis origin

Back 68

Coracoid process

Front 69

Coracobrachialis insertion

Back 69

Medial surface of mid-humeral shaft

Front 70

Subclavius

Back 70

Front 71

Subclavius actions

Back 71

Depress clavicle and draw it anteriorly

Elevate first rib to assist inhalation

Stabilize sternoclavicular joint

Front 72

Subclavius origin

Back 72

First rib and cartilage

Front 73

Subclavius insertion

Back 73

Interior surface of middle 1/3 of clavicle