Chapter 6 Opener Human blastocyst (at right) emerging from its zona pelucida
Figure 6.1 An unfertilized ovum
Figure 6.2 Maturation of sperm
Figure 6.2 Maturation of sperm
Figure 6.3 Fertilization and production of the conceptus
Figure 6.3 Fertilization and production of the conceptus
Figure 6.4 Development of the human conceptus
Figure 6.5 Blastocyst in the process of implanting itself
Figure 6.6 Stages of prenatal development
Figure 6.7 Alfred Jost’s experiments on rabbits
Figure 6.8 The genetic basis of sex determination
Box 6.1 Biology of Sex: Atypical Development: Chromosomal Anomalies
Figure 6.9 Sex determination
Box 6.2 Biology of Sex: Atypical Development: Gonadal Intersexuality
Figure 6.10 Migrating germ cells
Figure 6.11 Development of the male and female reproductive tracts
Figure 6.11 Development of the male and female reproductive tracts
Box 6.3 Biology of Sex: Atypical Development: Androgen Insensitivity Syndrome
Figure 6.12 Development of the male and female external genitalia
Figure 6.12 Development of the male and female external genitalia (Part 1)
Figure 6.12 Development of the male and female external genitalia (Part 2)
Figure 6.12 Development of the male and female external genitalia (Part 3)
Box 6.4 Biology of Sex: Atypical Development: Congenital Adrenal Hyperplasia
Figure 6.13 Descent of the testes
Figure 6.13 Descent of the testes
Figure 6.13 Descent of the testes (Part 1)
Figure 6.13 Descent of the testes (Part 2)
Box 6.5 Biology of Sex: Atypical Development: 5α-Reductase Deficiency
Box 6.6 Biology of Sex: Atypical Development: Hypospadias and Micropenis
Figure 6.14 The third interstitial nucleus of the anterior hypothalamus (INAH3)
Figure 6.15 Sexual differentiation in the hypothalamus
Figure 6.15 Sexual differentiation in the hypothalamus
Figure 6.16 Copulating rats
Figure 6.17 Hormones and sexual behavior in rats
Figure 6.17 Hormones and sexual behavior in rats
Figure 6.18 When monkeys copulate, the male often grasps the feet or legs of the female with his
own feet
Photo, p. 177 1957 advertisement for DES in a medical journal
Photo, p. 178 Because of variations in the timing of puberty, these 12-year-old girls vary a great
deal in their physical development
Figure 6.19 Growth velocity curves for boys and girls
Figure 6.20 Typical development of pubic hair in girls at puberty
Figure 6.21 Typical development of breasts in girls at puberty
Figure 6.22 Puberty is starting earlier
Figure 6.23 Typical development of male external genitalia at puberty
Figure 6.24 Hormonal control of puberty
Figure 6.24 Hormonal control of puberty
Box 6.7 Biology of Sex: Atypical Development: Precocious and Delayed Puberty
Figure 6.25 MRI slice through the human brain showing some of the regions whose size is affected
by sex hormone levels at puberty
Box 6.8 Personal Points of View: My Life with Androgen Insensitivity Syndrome