AOIs of Shoulder, Arm, and Forearm muscles

Page 174 of Lab textbook. A=Action O=Origin I=Insertion

Trapezius

A: Extends and abducts head, rotates and adducts scapula, fixes scapula
O: Occipital protuberance, nuchal ligament, spinous process of C7-T12
I: Clavicle, acromion process, spine of scapula

Latissimus dorsi

A: Extends, adducts, and medially rotates arm; depresses shoulder
O: T7-T12, L1-L5, sacrum, ribs 10-12, iliac crest
I: Intertubercular groove of humerus

Deltoid

A: Abducts, flexes, and extends arm; medially and laterally rotates arm
O: Clavicle, acromion process, spine of scapula
I: Deltoid tuberosity of humerus

Rhomboideus major

A: Adducts scapula
O: Spines of T1-T4
I: Inferior, medial border of scapula

Rhomboideus Minor

A: Adducts scapula
O: Nuchal ligament, spines of C6-C7
I: Medial border of scapula at scapular spine

Levator scapulae

A: Elevates scapula; abducts and rotates neck
O: C1-C4
I: Superior angle of scapula

Supraspinatus (rotator cuff)

A: Abducts arm; stabilizes shoulder joint
O: Supraspinous fossa
I: Greater tubercle of humerus

Infraspinatus (rotator cuff)

A: Extends and laterally rotates arm; stabilizes shoulder joint
O: Infraspinous fossa
I: Greater tubercle of humerus

Subscapularis (rotator cuff)

A: Extends and medially rotates arm; stabilizes shoulder joint
O: Subscapular fossa
I: Lesser tubercle of humerus

Teres minor (rotator cuff)

A: Extends, laterally rotates, and adducts arm; stabilizes shoulder joint
O: Lateral border of scapula
I: Greater tubercle of humerus

Teres major

A: Extends, adducts, and medially rotates arm
O: Lateral border of scapula
I: Crest of lesser tubercle of humerus

Triceps brachii

A: Extends and adducts arm; extends forearms
O: Infraglenoid tuberosity of scapula, lateral and posterior surface of humerus
I: Olecranon process of ulna

Pectoralis Major

A: Adducts, flexes, medially rotates arm
O: Sternum, clavicle, cartilages of ribs 1-7
I: Crest of greater tubercle of humerus

Pectoralis minor

A: Depresses glenoid cavity; raises ribs 3-5
O: Ribs 3-5
I: Coracoid process of scapula

Biceps brachii

A: Flexes arm, flexes forearm, supinates hand
O: Coracoid process of scapula, supraglenoid tubercle
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