The parenchyma consists of 30 to 50 tubuloalveolar glands. It has glandular epithelium that is mostly simple columnar and cuboidal epithelial cells but may have regions of pseudostratified columnar epithelium. it has basal cells, these are small, round stem cells resting on the basement membrane. Also, it has corpora amylacea which is a concretions of prostatic fluid in the lumen of some glands in older men. Often have concentric lamellar appearance and they gradually increase in number and size with age.

The stroma has a capsule, which is a dense irregular connective tissue with interlaced bundles of smooth muscle, and, perialveolar connective tissue which is dense irregular connective tissue with interlaced bundles of smooth muscle.

The columnar epithelial cells secrete a clear, slightly alkaline fluid into the urethra through short ducts.