The caudal dorsal serrate muscle (Serratus dorsalis caudali) is a muscle that originate from the thoracolumbar fascia caudally and attach by a series of individual digitations to the ribs lateral of the iliocostal muscles. .
Origin: Thoracolumbar fascia.
Insertion: Caudal border of the eleventh, twelfth and thirteenth ribs.
Action: Draws the last three or four ribs caudally for expiration
Note : the caudal dorsal serrate muscle (Serratus dorsalis caudali) is sometimes described as the caudal part of the "dorsal serrate muscle": this muscle is not termed in the Vth NAV because is an epaxial muscle that is completely divided into cranial and caudal parts with different innervation and function.