Pub. date: 2008 | Online Pub. Date: September 15, 2008 | DOI: 10.4135/9781412963954 | Print ISBN: 9781412959087 | Online ISBN: 9781412963954| Publisher:SAGE Publications, Inc.About this encyclopedia
Prostate Tissue Stem Cells
Daniel Xudong Shi
PROSTATE IS A male sex accessory organ surrounding the urethra below the urinary bladder that is located in the pelvic floor. The prostate stores and secretes a clear, slightly alkaline fluid to form semen with spermatozoa during ejaculation. The prostate fluid helps maintain the activity and life span of sperm. Male hormone testosterone is required for development and proper function of prostate. The human prostate is divided into the peripheral zone, the central zone and the transitional zone. Peripheral zone located in the peripheral part of the prostate gland and composes about 70 percent of the mass. Central zone constitutes the central part of the prostate gland that surrounds the ejacula—tory ducts. Most of the prostatic cancer originates from the peripheral zone, and only a small proportion, less than one—third, arises from central zone. Transition zone is between central and peripheral zone and this region rarely causes prostate cancer. There ...