Related Experiment Video
Updated: Feb 13, 2026

In Vivo Real-Time Study of Drug Effects on Carotid Blood Flow in the Ovine Fetus
Published on: April 28, 2023
A Case of Sciatica During Labor Due to an Occiput Posterior Fetus
Cassandra Wasson1, Telianne Chon1
1Anesthesia, Riverside University Health System Medical Center, Moreno Valley, California, United States.
Abstract:
A 28-year-old term G3P0020 received an epidural with complete pain relief. Approximately 19 hours after the epidural placement, the pain increased. Sensory levels were rechecked and were bilateral and adequate at T8. Further discussion revealed that the pain was unrelated to her contractions; it was in her buttocks and radiating down the leg. The possibility of the fetus being positioned occiput posterior (OP) was discussed. The patient was placed into knee-chest position with instantaneous relief of her pain. This is the only known case report of epidural breakthrough pain due to an OP fetal malposition with successful intra-partum pain management solely by position change.
Related Concept Videos
Development of the Sexual Organs in the Embryo and Fetus
Near the gonadal ridges, two duct systems are present: the mesonephric ducts (Wolffian ducts) and paramesonephric ducts (Müllerian ducts). These ducts form the basis for the...
Cranial Bones: Superior and Posterior View
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...

