Not a content of deep perineal pouch ?
**Core Concept**
The deep perineal pouch, also known as the deep perineal space, is a fascial compartment in the perineum that contains several vital structures. It is bounded by the inferior fascia of the urogenital diaphragm and the superior fascia of the urogenital diaphragm, and it plays a crucial role in the anatomy of the pelvic floor.
**Why the Correct Answer is Right**
The correct answer is one of the structures that do not belong to the deep perineal pouch. The contents of the deep perineal pouch include the urethral sphincter, the deep transverse perineal muscle, the perineal body, the bulbospongiosus muscle, the ischiocavernosus muscle, the superficial transverse perineal muscle, the external urethral sphincter, and the great vestibular glands. These structures are all located within the deep perineal pouch and play important roles in the support and innervation of the pelvic organs.
**Why Each Wrong Option is Incorrect**
**Option A:** The external anal sphincter is actually located in the superficial perineal pouch, not the deep perineal pouch. This muscle is responsible for voluntary control over the anus.
**Option B:** The prostate gland is a male reproductive organ that is located in the pelvic cavity, but it is not contained within the deep perineal pouch. It is actually located below the bladder and in front of the rectum.
**Option C:** The membranous part of the urethra is actually located within the deep perineal pouch. It is the shortest part of the urethra and is surrounded by the external urethral sphincter.
**Option D:** The inferior rectal vessels are actually located in the superficial perineal pouch. They supply blood to the external anal sphincter and the skin around the anus.
**Clinical Pearl / High-Yield Fact**
The deep perineal pouch is an important anatomical compartment that contains several vital structures. It is bounded by two fascial layers and is located between the urogenital diaphragm and the perineal body. Knowledge of the contents and boundaries of the deep perineal pouch is essential for understanding pelvic floor anatomy and for performing surgical procedures in the perineal region.
**Correct Answer: D. The inferior rectal vessels.**