A lower transverse line midway between the upper transverse and the upper border of the symphysis pubis; this is termed the<unk>  (or transtubercular), since it practically corresponds to that passing through the iliac tubercles; behind, its plane cuts the body of the fifth lumbar vertebra.
Intertubercular plane
Subcostal plane
Costomediastinal recess
Sternocostal surface
Mediastinal pleura
Sternal plane
Danger space
Hilum