Origin: paired evaginations of the ductus deferense distal to the ampulla.
Function: secretion of fluid rich in fructose, the principal metabolic substrate for sperm, and prostaglandins.
Composition: elongate, highly folded tubular glands
Function: contraction during ejaculation discharges their secretion the ejaculatory ducts and helps to flush sperm out.
Location: around the proximal urethra
Function: secretion of acid phosphotase, fibrinolysin, and citric acid to liquefy the semen.
Composition: fibromuscular stroma with 30 - 50 tubuloalveolar glands, those ducts empty into the urethra. Three concentric layers of glands: a mucosal layer, a submucosal layer, and the most peripheral layer containing the main prostatic glands.
Location: proximal portion of urethra
Function: mucus-like secretion of the preseminal fluid, lubrication of the urethra
Composition: compound tubuloalveolar glands are lined by the simple columnar epithelium of different height