Transversalis Muscle & Sheath Of Rectus Abdominis Muscle

The transversalis muscle arises from the outer one third of Poupart's ligament, the anterior two-thirds of the inner lip of the crest of the ilium, the lumbar fasciam and the inner surface of the lower six costal cartilages, interdigating with the diaphragm, 1903. From 'Surgical Anatomy: The Treatise of the Human Anatomy and Its Applications to the Practice of Medicine and Surgery, Volume III' (1903). The sheath of the rectus abdominis muscle, which has been described within the internal oblique muscle, contains the rectus abdominis and pyramidalis muscles, the superior epigastric artery and its venae comites, the terminal portion of deep epigastric artery and its venae comites, and is transversed by the lower intercostal nerves. (Photo by VintageMedStock/Getty Images)