Name

# Serratus Posterior Superior

Pronunciation

(ser-RA-tus pos-TEER-I-or soo-PER-e-or)

Origin/Proximal Attachment

Spines of C7, T1-2 (3)

Insertion/Distal Attachment

Ribs 2-5

Action/Relevance

Expands the chest by raising the ribs to which it is attached

Innervation

T1-4

Notes

The Serratus posterior superior (Serratus posticus superior) is a thin, quadrilateral muscle, situated at the upper and back part of the thorax. It arises by a thin and broad aponeurosis from the lower part of the ligamentum nuchae, from the spinous processes of the seventh cervical and upper two or three thoracic vertebrę and from the supraspinal ligament. Inclining downward and lateralward it becomes muscular, and is inserted, by four fleshy digitations, into the upper borders of the second, third, fourth, and fifth ribs, a little beyond their angles.