PECTORALIS 

MINOR From A . M . Paterson, Cunningham's Text Book of Anatomy . of which are noticed in the article ANATOMY (Superficial and Artistic), and the morphology of which is referred to later . In front of the lowest part of the rectus is sometimes a small triangular muscle called the pyramidalis . The quadratus lumborum is a muscle at the back of the abdominal wall which runs between the last rib and the crest of the ilium . In front of the bodies of the vertebrae is a prevertebral or hypaxial musculature, of which the rectus ca pills anticus major and minor muscles and longus colli in the neck and the psoas in the loins form the chief parts, the latter being familiar as the undercut of the sirloin of beef, while the pelvis is closed below by a muscular floor formed by the levator ani and coccygeus muscles . The diaphragm is explained in a separate article .