Name
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.