Which structure separates the deep and superficial perineal spaces?

Which structure separates the deep and superficial perineal spaces?

• A. Fascia of obturator internus
• B. Inferior fascia of UG diaphragm
• C. Perineal membrane (inferior fascia of UGD)
• D. Pelvic diaphragm

Answer: (C)

The boundary between the deep and superficial perineal spaces is the perineal membrane, the inferior fascia of the urogenital diaphragm. This fibrous sheet stretches from the pubic rami to the ischiopubic rami and acts as the roof of the superficial perineal pouch while forming the floor of the deep perineal pouch. In other words, the deep space lies above it and the superficial space below it, with the membrane effectively separating the two. The fascia of obturator internus is a lateral wall, not a divider between these spaces, and the pelvic diaphragm forms the pelvic floor rather than the boundary within the perineum. The inferior fascia of the UG diaphragm is the same structure as the perineal membrane, but the standard label emphasizing the divider is perineal membrane.

The boundary between the deep and superficial perineal spaces is the perineal membrane, the inferior fascia of the urogenital diaphragm. This fibrous sheet stretches from the pubic rami to the ischiopubic rami and acts as the roof of the superficial perineal pouch while forming the floor of the deep perineal pouch. In other words, the deep space lies above it and the superficial space below it, with the membrane effectively separating the two. The fascia of obturator internus is a lateral wall, not a divider between these spaces, and the pelvic diaphragm forms the pelvic floor rather than the boundary within the perineum. The inferior fascia of the UG diaphragm is the same structure as the perineal membrane, but the standard label emphasizing the divider is perineal membrane.