You mean embryology textbooks are flawed. Because this is what they teach.
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Clark Edward and Corliss Patten’s Human Embryology, McGraw – Hill Inc., 30
Keith L. Moore, The Developing Human: Clinically Oriented Embryology, 7th edition. Philadelphia, PA: Saunders, 2003. pp. 16, 2.
Signorelli et al., Kinases, phosphatases and proteases during sperm capacitation, CELL TISSUE RES. 349(3):765 (Mar. 20, 2012)
Keith L. Moore, Before We Are Born: Essentials of Embryology, 7th edition. Philadelphia, PA: Saunders, 2008. p. 2.
Ronan O’Rahilly and Fabiola Miller, Human Embryology and Teratology, 3rd edition. New York: Wiley-Liss, 2001. p. 8.
Dr. Morris Krieger “The Human Reproductive System” p 88 (1969) Sterling Pub. Co
James Bopp, ed., Human Life and Health Care Ethics, vol. 2 (Frederick, MD: University Publications of America, 1985)
Rand McNally, Atlas of the Body (New York: Rand McNally, 1980) 139, 144
Leslie Brainerd Arey, “Developmental Anatomy” seventh edition space (Philadelphia: Saunders, 1974), 55
DeCoursey, R.M., The Human Organism, 4th edition McGraw Hill Inc., Toronto, 1974. page 584
Thibodeau, G.A., and Anthony, C.P., Structure and Function of the Body, 8th edition, St. Louis: Times Mirror/Mosby College Publishers, St. Louis, 1988. pages 409-419
Turner, J.S., and Helms, D.B., Lifespan Developmental, 2nd ed., CBS College Publishing (Holt, Rhinehart, Winston), 1983, page 53
Carlson, Bruce M. Patten’s Foundations of Embryology. 6th edition. New York: McGraw-Hill, 1996, p. 3
Considine, Douglas (ed.). Van Nostrand’s Scientific Encyclopedia. 5th edition. New York: Van Nostrand Reinhold Company, 1976, p. 943
Kaluger, G., and Kaluger, M., Human Development: The Span of Life, page 28-29, The C.V. Mosby Co., St. Louis, 1974
Langman, Jan. Medical Embryology. 3rd edition. Baltimore: Williams and Wilkins, 1975, p. 3
Human Embryology, 3rd ed. Bradley M. Patten, (New York: McGraw Hill, 1968), 43.
Essentials of Human Embryology, William J. Larsen, (New York: Churchill Livingstone, 1998), 1-17.
Human Embryology & Teratology, Ronan R. O’Rahilly, Fabiola Muller, (New York: Wiley-Liss, 1996), 5-55.
The Developing Human: Clinically Oriented Embryology, 6th ed. Keith L. Moore, Ph.D. & T.V.N. Persaud, Md., (Philadelphia: W.B. Saunders Company, 1998), 2-18