Trapezius

(Origin and insertion)

origin: external occipital protuberance, superior nuchal line, ligamentum nuchae, spines C7-C12

Insertion: spine of scapula, acromion, and lateral third of the clavicle

Trapezius

(innervation)

trapezius

(action)

levator scapulae

(origin and insertion)

origin: transverse processes of C1-C4

Insertion: medial border of the scapula

levator scapula

(innervation)

levator scapulae

(action)

rhomboid minor

(origin and insertion)

origin: spines of C7-T1

Insertion: root of spine of scapula

rhomboid minor

(innervation)

rhomboid minor

(action)

rhomboid major

(origin and insertion)

origin: spines of T2-T5

insertion: medial border of scapula

rhomboid major

(innervation)

rhomboid major 

(action)

latissimus dorsi

(origin and insertion)

origin: spines of T7-T12, thoracodorsal fascia, iliac crest, ribs 9-12

insertion: floor of bicipital groove of the humerus

latissimus dorsi

(innervation)

latissimus dorsi

(action)

serratus posterior-superior

(origin and insertion)

origin: ligamentum nuchae, supraspinal ligament, and spines of C7-T3

insertion: upper border of ribs 2-5

serratus posterior-superior

(innervation)

serratus posterior-superior

(action)

serratus posterior-inferior

1. (origin and insertion)

origin: supraspinous ligament and spines T11-T13

insertion: lower border of ribs 9-12

serratus posterior-inferior

(innervation)

serratus posterior-inferior

(action)