PECTORALIS MAJOR

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

I - Crest greater tubercle humerus

Actions

All fibers:  Adduct shoulder, medially rotate shoulder, assist elevating thorax in forced inhalation

Upper fibers:   Flex shoulder (gh joint), horizontally adduct shoulder (gh joint)

Lower fibers:  Extend shoulder (gh joint)

PECTORALIS MINOR

O - Ribs 1,2, and 3

I - Coracoid process of scapula

actions

*Depress scapula

*Abduct scapula

*Tilt scapula anteriorly

*Assist in forced inhalation when scapula fixed

BICEPS BRACHII

O - (short head) Coracoid process of scapula

(long head) Supraglenoid tubercle scapula

I - Tuberosity of radius and aponeurosis bicep brachii

ACTIONS

 *Flex elbow (humeroulnar joint)

*Supinate forearm (radioulnar joint)

*Flex shoulder (glenohumeral joint)

SERATTUS ANTERIOR

O - Surface upper 8 or 9 ribs

I - Anterior surface medial border scapula

Actions

With origin fixed:  Abduct scapula, depress scapula, hold medial border scapula against rib cage

If scapula fixed:  May act in forced inhalation

DELTOID

O - Later 1/3 clavicle, acromion, spine of scapula

I - Deltoid tuberosity

Actions  (all act on glenohumeral joint)

 All Fibers:  Abduct shoulder

Anterior fibers:  Flex shoulder, medially rotate shoulder, horizontally adduct shoulder

Posterior fibers:  Extend shoulder, Laterally rotate shoulder, horizontally abduct shoulder

TRAPEZIUS

O - External occipital protuberance, medial portion superior nuchal line of occiput, ligamentum nuchae, spinous processes C7-T12

I - Lateral 1/3 clavicle, acromion, spine of scapula

Upper Fibers: Extend head and neck (bilaterally)

(unilaterally)Latterally flex head and neck, same side.  Rotate head and neck opposite side, elevate scapula, upwardly rotate scapula

Middle Fibers:  Adduct scapula, stabalize scapula

Lower Fibers:  Depress scapula, upwardly rotate scapula

LATTISIMUS DORSI

O - Spinous process T6-T12, ribs 8 or 9-12, thoracolumbar aponeurosis and posterior iliac crest

I - Crest lesser tubercle humerus

Actions:

 *Extend shoulder

*Adduct shoulder

*Medially rotate shoulder

TERES MAJOR

O - lateral side inferior angle and lower half lateral border scapula

I - Crest of lesser tubercle humerus

Actions:

 (same as Lats)

*Extend shoulder

*Adduct shoulder

*Medially rotate shoulder

ROTATOR CUFF MUSCLES

NAME THEM.......

*Supraspinatus

*Infraspinatus

*Subscapularis

*Teres Minor

SUPRASPINATUS

O - Supraspinous fossa

I - Greater tubercle humerus

Actions:

*Abduct shoulder

*Stabalize head of humerus

INFRASPINATUS

O - Infraspinous fossa scapula

I - Greater tubercle humerus

Actions:

*Latterally rotate shoulder

*Adduct shoulder

*Extend shoulder

*Horizontally abduct shoulder

*Stabalize head of humerus

SUBSCAPULARIS

O - Subscapular fossa scapula

I - Lesser tubercle humerus

Actions:

*Medially rotate shoulder

*Stabalize head of humerus

TERES MINOR

O - Superior 1/2 lateral border scapula

I - Greater tubercle humerus

Actions:

*Latterally rotate shoulder

*Adduct shoulder

*Extend shoulder

*Horizontal abduct shoulder

*Stabalize head of humerus

TRICEPS BRACHII

O - Long head: Infraglenoid tubercle scapula

Lateral head: Posterior surface proximal half humerus

Medial head: Posterior surface distal half humerus

I - Olecranon process of ulna

Actions:

*Extend elbow

*Extend shoulder

*Adduct shoulder

RHOMBOIDS

O - Spinous process C7-T5

I - Medial border scapula

Actions:

*Adduct scapula

*Elevate scapula

*Downwardly rotate scapula

LEVATOR SCAPULA

O - Transverse process C1-C4

I - Upper region medial border superior angle scapula

Actions:

unilateral: Elevate scapula, downwardly rotate scapula, latterally flex head/neck, rotate head/neck same side

bilateral:  Extend head/neck