Back and Upper Muscles

Splenius Capitis

Origin (none) insertion (none) action (extend head and neck)

Semispinalis capitis

Origin (none) insertion (None) action (extend head and neck)

Spinalis

origin (none) insertion (none) action (extend vertebral column)

Longissimis

Origin (none) insertion (none) action (extend vertebral column)

Ilicostalis

Origin (none) insertion (none) action (extend vertebral column)

Deltoid

Origin (clavicle acromion, spine of scapula) insertion (deltoid tuberosity) action (ABduct shoulder)

Coracobrachiales

Origin (coracoid process) insertion (humerus) action (adduct shoulder, flex shoulder)

Pectoralis major

Origin (clavicle,sternum,ribs) insertion (greater tubercle) action (adduct shoulder, internally rotate shoulder)

Latissumus Dorsi

Origin (ribs 9-11, spinous process T7-t12, thoraculumbar fascia, iliac crest) insertion (bicipital groove) action (adduct shoulder, internally rotate shoulder)

Teres major

Origin (scapular inferior angle) insertion (bicipital groove) action (adduct shoulder, extend shoulder)

Levator scapulae

Origin (transverse process C1-T1) insertion (scapular superior angle) action (elevate scapula)

Trapezius

Origin (superior nuchal line, spinous process c1-t12) insertion (clavicle, acromion, scapular spine) action (elevate scapula, retract scapula, depress scapula)

Pectoralis minor

Origin (ribs 3-5) insertion (coracoid process) action (fix scapula to thoracic wall, depress scapula)

Serratus anterior

Origin (ribs 1-9) insertion (scapular medial border) action (fix scapula to thoracic wall, protract scapula)

Rhomboid minor

Origin (spinous process c7-t1) insertion (scapular medial border) action (fix scapula to thoracic wall, retract scapula)

Rhomboid major

Origin (spinous process t2-t5) insertion (scapular medial border) action (fix scapula to thoracic wall, retract scapula)

Supraspinatus

Origin (supraspinous fossa) insertion (greater tubercle) action (initiates ABduction of shoulder)

Infraspinatus

Origin (infraspinous fossa) insertion (greater tubercle) action (externally rotates shoulder)

Teres minor

Origin (scapular later border) insertion (greater tubercle) action (externally rotates shoulder)

Subscapularis

Origin (subscapular fossa) insertion ( lesser tubercle) action (internally rotate shoulder)

Biceps brachii

Origin (supraglenoid tubercle, coracoid process) insertion (radial tuberosity) action (flex elbow, supinate forearm)

Brachioradialis

Origin (humerus) insertion (radial styloid process) action (flex elbow)

Brachialis

Origin (humerus) insertion (ulnar tuberosity) action (flex elbow)

Pronator teres

Origin (common flexor tendon of humeral medial epicondyle) insertion (radius) action (flex elbow, pronate arm)

Triceps brachii

Origin (infraglenoid tubercle, humerus) insertion (olecranon) action (extend elbow)