Cite this page: Anatomy. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/prostateanatomy.html. Accessed October 25th, 2016.
Definition / General
- 20g, funnel shaped, 4 x 3 x 2 cm
- Within true pelvis between bladder neck (base of prostate) and urogenital diaphragm / levator ani muscle (apex of prostate)
- Apex contains some muscle fibers from urogenital diaphragm
- Seminal vesicles extend from posterior prostate to posterior surface of bladder
- Ampulla of Vas (ductus) deferens and terminal seminal vesicle duct form ejaculatory duct, join prostatic utricle to open into prostatic urethra
- Denonvillier's fascia (also called rectovesicle septum): thin layer of connective tissue that separates prostate and seminal vesicles from rectum
- Prostatic urethra begins on superior surface, descends almost vertically, with continuous prostatic utricle extending to posterior prostatic wall, exits anteriorly
- Divided into halves by sharp 35 degree angle midway, at site of verumontanum (bulge along posterior proximal urethra
- Site of emptying of ejaculatory, central and transition zone ducts)
- Peripheral zone ducts empty into distal urethra
- Prostatic nervous plexus supplies prostate, seminal vesicles, corpus spongiosum, corpora cavernosum and urethra
- Nerves are distributed evenly in apex, mid gland and base of prostate (Am J Clin Pathol 2001;115:39)
- Function: conduit for urine, adds nutritional secretions to sperm to form semen during ejaculation
- Embryologic model: 5 lobes, 2 lateral plus posterior, middle, anterior lobes
- Other model (not used): 2 lateral lobes, small median lobe (contains posterior lobe, forms floor of urethra)
- Current model (McNeal): transitional, central, peripheral, periurethral zones (Prostate 1981;2:35)
- Outer (cortical) zones are termed "peripheral" and "central"
- Central is towards base
- Inner (periurethral) zone is termed "transitional"
Diagrams / Tables