Which structure is the major component of the deep perineal space?

Which structure is the major component of the deep perineal space?

• A. Bulbospongiosus
• B. Detrusor muscle
• C. Sphincter urethrae
• D. Ischiocavernosus

Answer: (C)

The deep perineal space is dominated by the external urethral sphincter (sphincter urethrae), the primary muscle for voluntary control of the urethral outlet. This circular muscle surrounds the membranous part of the urethra within the deep perineal pouch, forming the main continence mechanism as part of the urogenital diaphragm. While other structures like the bulbourethral glands and deep transverse perineal muscles are also in this space (in males), the external urethral sphincter is the defining component. In contrast, bulbo-spongiosus and ischiocavernosus are components of the superficial perineal pouch, and the detrusor muscle resides in the bladder wall, not in the perineal space.

The deep perineal space is dominated by the external urethral sphincter (sphincter urethrae), the primary muscle for voluntary control of the urethral outlet. This circular muscle surrounds the membranous part of the urethra within the deep perineal pouch, forming the main continence mechanism as part of the urogenital diaphragm. While other structures like the bulbourethral glands and deep transverse perineal muscles are also in this space (in males), the external urethral sphincter is the defining component. In contrast, bulbo-spongiosus and ischiocavernosus are components of the superficial perineal pouch, and the detrusor muscle resides in the bladder wall, not in the perineal space.