Pectoral girdle and shoulder muscles

muscles in pectoral girdle

trapezius

levator scapular

rhomboids

trapezius origin

external occipital protuberance, ligamentum nuchae, and spinous processes

trapezius insertion

clavicle, scapula

trapezius function

elevate, retract and depress scapula

levator scapulae origin

transverse processes of cervical vertebrae

levator scapulae insertion

superior angle of scapula

levator scapulae function

elevate scapula

rhomboids origin

spinous processes C7-T5

rhomboids insertion

medial border of scapula

rhomboids function

retract (adduct) scapula

muscles in shoulder

deltoid

pectoralis major

latissimus dors

teres major

deltoid innervated by

axillary nerve

deltoid origin

scapula, clavicle

deltoid insertion

deltoid tuberosity

deltoid function

abduction of humerus + flexion and extension

pectoralis major origin

clavicle, sternum, costal cartilages

pectoralis major insertion

bicipital groove

pectoralis major function

flexion, adduction, and medial rotation of the arm

latissimus dorsi origin

spinous processes of T7-T12, iliac crest, inferior ribs

latissimus dorsi insertion

bicipital groove

latissimus dorsi function

extend, adducts, medially rotates arm

teres major origin

inferior angle of scapula

teres major insertion

bicipital groove

teres major function

extends, adducts, medially rotates arm

biceps brachii tendon

runs through bicipital groove superficial to other tendinous insertions