Anatomy Upper Limb Muscle OIAs

Trapezius (Origin)

Nuchal ligament of occipital bone, thoracic vertebrae

Trapezius (Insertion)

clavicle, scapular spine, acromion of scapula

Trapezius (action)

elevate, retract, depress, or rotate scapula upward; elevate clavicle, extends neck

Levator Scapulae (origin)

vertebrae C1-C4

Levator Scapulae (insertion)

medial border of scapula

Levator Scapulae (action)

elevates scapula

Rhomboid minor (origin)

vertebrae C7-T1

Rhomboid minor (insertion)

medial border of scapula

Rhomboid minor (action)

adducts the scapula

Rhomboid major (origin)

vertebrae T1-T5

Rhomboid major (insertion)

medial border of scapula

Rhomboid major (action)

adducts the scapula

Subclavius (origin)

superior border of rib 1

Subclavius (insertion)

inferior border of clavicle

Subclavius (action)

depresses the clavicle

Pectoralis minor (origin)

ribs 3-5

Pectoralis minor (insertion)

coracoid process of scapula

Pectoralis minor (action)

depresses shoulder, rotates scapula downward, elevates ribs if scapula is stationary

Serratus anterior (origin)

ribs 1-9

Serratus anterior (insertion)

medial border of scapula