What percentage of final semen volume is contributed by sperm cells themselves?

1. Semen is a mixture of sperm and secretions from three accessory glands. 2. Sperm themselves are a small minority of the fluid's total volume. 3. Sperm make up only 5 percent of final semen volume. 4. 25 percent and 60 percent are both different figures a reader might guess from memory, but neither matches the specific figure given here. 5. 90 percent is also incorrect for the same reason: it does not match the specific figure given here. 6. The bulk instead comes from the seminal vesicles, prostate, and bulbourethral glands. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 27 "The Reproductive System", p.1286 §Duct System_