Transversus abdominis is the deepest of the abdominal muscles and wraps around the abdomen between the lower ribs and top of the pelvis, functioning like a corset.This picture shows the anatomy of this muscle with the outer two abdominal layers (internal and external oblique) removed.ie on your back, or side, or sit with the spine in a neutral posture. Firmly palpate your abdomen 1-2 inches inside of your hip bones. Try the following cues to connect to (contract) your pelvic floor: 1  Females-Think of your vagina as a clock, pubis is 12, tailbone is 6, left lateral wall is 3, right lateral wall is 9.