Prostate Gland




The prostate gland surrounds the bladder neck and the urethra and secretes a component of semen.



骨盤腔  pelvic cavity;

射精  ejaculation;

射精管  ejaculatory duct;

精嚢  seminal vesicle;

前縁  cranial border;

腺房  acinus;

前立腺  prostate gland;

前立腺管  prostatic duct;

恥骨結合  symphysis pubis;

直腸  rectum;

尿道  urethra;

膀胱頚部  bladder neck





Credit: Prostate gland, Johns Hopkins


The prostate gland, which is a gland for males, surrounds the bladder neck and the proximal part of the urethra and secretes a fluid that is a part of semen.



The prostate gland has a chestnut shape and is situated in the pelvic cavity, below the symphysis pubis and in front of the rectum.  When the prostate gland is enlarged, it can be felt through the wall of the rectum. 



Located at a depression on the cranial border of the prostate gland are two ejaculatory ducts from the seminal vesicles.



The prostate gland is composed of gland cells, fibrous cells, and muscular cells.  The gland cells secrete a component of semen.  The fibrous cells support the prostate gland.  The muscular cells control ejaculation and urine flow.



In young males, the weight of the prostate gland is about 20 g.



The acini of the prostate gland are connected to the urethra through the prostatic ducts.  The acini secrete about 20% of components of semen.



Although prostatic fluid contains citrate, zinc, and polyamines, their roles in the reproduction have been scarcely cleared.