Muscle origins and insertions

Serratus anterior

Origin- ribs 1-8, Insertion- medial border of scapula

Pectoralis minor

Origin- ribs 3-5

Insertion- Scapula

Sternoclediomastoid

Origin- Sternum/clavicle

Insertion- Mastoid process & lateral half of occipital bone

Scalene

Origin- C3-C7

Insertion: Ribs

Superior trapezius

Origin: Occipital bone

Insertion: Clavicle/acromion

Middle trapezius

Origin- Cervical/thoracic vertebrae

Insertion- Spine of scapula

Inferior trapezius

Origin- Lower thoracic vertebrae

Insertion- Base of scapular spine

Rhomboid major

Origin- T2-T5

Insertion- Medial border of scapula

Rhomboid minor

Origin- Ligamentum nuchae/C7-T1

Insertion- Medial border of scapula

Latissimus dorsi

Origin- Lower ribs, iliac crest

Insertion- Intertubercular sulcus, groove of humerus