• origin- supraspinatus fossa
• insertion- greater tuberosity (superior)
• innervation- suprascapular N.
• action- abduct arm

• origin- infraspinatus fossa of scapula
• insertion- greater tuberosity
• innervation- suprascapular N.
• action- ER arm

• origin- lat. scapula
• insertion- greater tuberosity
• innervation- axillary N.
• action- ER arm

• origin- subscapular fossa
• insertion- lesser tuber
• innervation- upper and lower subscapular N.
• action- IR, adduct arm

• origin- clavicle, acromion spine of scapula
• insertion- deltoid tuberosity
• innerv- axillary N.
• action- abduct arm

• origin- inf. angle of scapula
• insertion- intertubercular grove of humerus
• innerv- low subscapular N.
• action- IR, adduct arm

protects radial N. in post. approach

• origin- C7-T12 spinous process
• insertion- clavicle, acromion spine of scapula
• innervation- CN XI
• action- elevate, rotate scapula

• origin- T7-T12, iliac crest
• insertion- intertubercular grove
• innervation- thoracodorsal N.
• action- adduct, extend, IR arm at shoulder joint

• levator scapulae
• rhomboid major
• rhomboid minor

• origin- C1-C4 transverse process
• insertion- sup. med. scapula
• innervation- dorsal scapular N., C3,C4
• action- elevate scapula

• origin- C7-T1 spinous processes
• insertion- med. scapula at spine
• innervation- dorsal scapular N.
• action- adduct scapula

• origin- T2-T5 spinous process
• insertion- med. scapula
• innerv- dorsal scapular
• action- adduct scapula

1. sup. thoracic A.
2. thoracoacromial trunk (clavicular, acromial, deltoid, pectoral branches)
3. lateral thoracic (runs w/long thoracic N.)
4. subscapular
1. circumflex scapular A.
2. thoracodorsal A. (runs w/thoracodorsal N.)
5. ant. circumflex humeral
6. post. circumflex humeral

• origin
• clavicle
• sternum
• insertion- intertubercular groove of humerus
• innervation- lat. and med. pectoral N.
• action- adduct, IR, flex at shoulder joint 

• origin- ribs 1-8 laterally
• insertion- ant. med. border of scapula
• innervation- long thoracic N.
• action- holds scapula to chest wall 

• origion- ribs 3-5
• insertion- coracoid process of scapula
• innerv- med pectoral N.
• action- stablize scapula 

• borders
• teres minor
• teres major
• long head of triceps brachi
• structures- circumflex scapular A.

• borders
• teres minor
• teres major
• long head of triceps brachi
• med. border of humerus
•  structures
• axillary N.
• post. circumflex humeral A.

• borders
• teres major
• long head of triceps brachii
• lat. head of triceps brachii
• structures
• radial N.
• deep artery of arm 

• origin- rib one and costal cartilage
• insertion- inf. border of middle 1/3 of clavicle
• innervation- N. to sublavius
• action- depress clavicle 

• superior
• middle
• inferior
• ant. band
• post. band 

• attachment- ant. sup. glenoid rim/labrum to prox. lesser tuberosity
• function
• resist inf. translation and ER in shoulder ADDUCTION 
• resist post. translation in 90 degrees of forward flexion

• attachment- ant. sup. glenoid rim/labrum to just med. to lesser tuberosity 
• function
• resist ant. post. translation in 45 degrees of abduction
• secondary restraint to translation and ER in adduction

• anterior band
• attachments- ant. glenoid/labrum (3 o clock) to inf. humeral neck
• function- resist ant. and inf. translation in abduction and ER
• post band
• attachment- post glenoid/labrum (9 o clock) to inf. humeral neck
• function- resist post. transation in IR and 90 degrees flexion

• coracoacromial ligament
• coracoclavicular ligaments (trapezoid, conoid)
• conjoined tendon (coracobrachialis and short head of biceps)
• pectoralis minor

• AC- prevent AP displacement
• CC- prevent superior displacement of distal clavicle