QS Study


The fluid that is ejaculated at the time of orgasm is known as the semen which contains sperm and secretion of the seminal vesicles, prostate, Cowper’s gland and probably the urethral glands. The fluid comes from the prostate, seminal vesicles, and other sex glands.

An average volume per ejaculate is 2.5 – 3.5 ml after several days of continence.

The composition of semen: It is a substance produced by the male reproductive organs.

  • Color: White, opalescent,
  • Specific gravity: 1.028
  • PH: 7.38 – 7.50

Sperm count:

  • 100 million/ml (average) with fewer than 20% abnormal forms.
  • Unfertilized sperm present.

Fig: Composition of Semen

Other components:

(A) From seminal vesicles: The seminal vesicles produce a viscous fluid which is yellowish in color and is rich in fructose. (Contributes 60% of total volume):

  • Fructose (1.5 – 6.5 mg/ml),
  • Phosphorylcholine,
  • Ergothioneine,
  • Ascorbic acid,
  • Flavins,
  • Prostaglandins,
  • Fibrinogen.

(B) From prostate: The prostatic secretions contain citric acid, prostate-specific antigen, acid phosphatase, zinc, and proteolytic enzymes. (Contributes 30% of total volume):

  • Spermine,
  • Citric acid,
  • Cholesterol,
  • Phospholipid,
  • Fibrinolysin, fibrinogen,
  • Zinc,
  • Calcium,
  • Acid phosphates,
  • Clotting enzyme.

(C) Buffers:

  • Phosphate,
  • Bicarbonate,
  • Hyaluronidase.

The prostate fluid gives milky appearance and seminal vesicles fluid gives mucoid consistency.