anatomy back muscle

Trapezius

O:Occipital bone, C7, Thoracic vertebrae

I:Scapular, Clavicle

A: Extends, elevates, rotates, retracts scapula: secondary extends head

Latissimus Dorsi

O: Lower vertebrae, illium

I: Humerus

A: Extends, adducts and medially rotates arm

Serratus Dorsi

O: Upper 8 ribs

I: Scapula

A: Protracts and rotates scapula superiorly and laterally

Rhomboideus

O: C7-T5

I: Scapula

A: Stabilize scapula

Pectoralis major

O: Clavicle, sternum, scapular spine

I: humerus

A: flexes, adducts, and medially rotates arm

Pectoralis Minor

O: ribs 3,4,5

I: Scapular

A: Draws scapular anteriorly and inferiorly

Deltoids

O: Clavicle, acromian, scapular spine

I: Humerus

A: Abducts arm

Supraspinatus

O: Scapula

I: Humerus

A: abducts and stebilizes humerus

Infraspinatus

O: Infraspinous fossa

I: Humerus

A: lateral rotation of humerus

Triceps brachii

O: Scapula, humerus

I: Ulna

A: extends forearm