Hypaxial
Trunk muscles can be broadly divided into hypaxial muscle, which lie ventral to the transverse processes of the vertebrae and epaxial muscles, which lie dorsal to the transverse process of the vertebrae. Both groups of muscle include the vertebral, respiratory and abdominal muscles.
Location
The muscle is located on the lower side of the body, below the horizontal septum.[1] usually inn by dorsal rami.
References
Source: adapted by the editor from Wikipedia, the free encyclopedia; from the article "Hypaxial". Image Credit.