An example of partial placenta previa where placenta partially obiterates cervical os but does not cover it. Uterus and cervix in sagittal section (top) and schematically from below (bottom).

Sagittal section of lumbar area of spinal column showing pertinent anatomy. Needle is removed leaving catheter in place between L3 and L4 vertebrae.

Sagittal section of lumbar area of spinal column showing pertinent anatomy. Left: needle inserted into epidural space between L3 and L4 vertebrae. Right: Needle is removed leaving catheter in place.

Anterior and medial thigh muscles - 1. B. Superficial dissection of muscles of anterior and medial aspects of thigh, anterior view.

Pelvis major and minor, sagittal section.