Which zone constitutes about 65% of the prostate volume?

Which zone constitutes about 65% of the prostate volume?

• A. Central zone
• B. Transitional zone
• C. Peripheral zone
• D. Anterior fibromuscular stroma

Answer: (C)

Understanding how the prostate is divided into zones and how much each zone contributes to the gland’s volume is key here. The peripheral zone is the largest component, containing most of the prostatic glands, and accounts for about two-thirds of the gland—roughly 65% of the prostate’s volume. The central zone makes up the next sizable portion, around a quarter. The Transitional zone is relatively small under normal conditions, around 5%, and the anterior fibromuscular stroma is mainly fibromuscular tissue with little glandular tissue. This distribution explains why cancers arise most often in the peripheral zone and why conditions like BPH involve the transitional zone.

Understanding how the prostate is divided into zones and how much each zone contributes to the gland’s volume is key here. The peripheral zone is the largest component, containing most of the prostatic glands, and accounts for about two-thirds of the gland—roughly 65% of the prostate’s volume. The central zone makes up the next sizable portion, around a quarter. The Transitional zone is relatively small under normal conditions, around 5%, and the anterior fibromuscular stroma is mainly fibromuscular tissue with little glandular tissue. This distribution explains why cancers arise most often in the peripheral zone and why conditions like BPH involve the transitional zone.