Ulr

Female pronucleus

Centrosome

Figure 82-1

Fertilization of the ovum. A, The mature ovum surrounded by the corona radiata. B, Dispersal of the corona radiata. C, Entry of the sperm. D, Formation of the male and female pronuclei. E, Reorganization of a full complement of chromosomes and beginning division of the ovum. (Modified from Arey LB: Developmental Anatomy: A Textbook and Laboratory Manual of Embryology, 7th ed. Philadelphia: WB Saunders, 1974.)

Fertilization (day 1)

Cell division

Blastocyst

Trophoblastic cells invading endometrium

Uterus

Figure 82-2

Trophoblastic cells invading endometrium

Uterus

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Essentials of Human Physiology

Essentials of Human Physiology

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