PART 16: Endocrinology and Metabolism
SECTION 1 Endocrinology
346 Disorders of the Testes and Male Reproductive System
 | Figure 346-1 Pubertal events in males. Sexual maturity ratings for genitalia and pubic hair and divided into five stages. (From WA Marshall, JM Tanner: Arch Dis Child 45:13, 1970.) |
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 | Figure 346-2 Human pituitary gonadotropin axis, structure of testis, seminiferous tubule. E2, 17β–estradiol; DHT, dihydrotestosterone. |
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 | Figure 346-3 The biochemical pathway in the conversion of 27-carbon sterol cholesterol to androgens and estrogens. |
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 | Figure 346-4 Androgen metabolism and actions. SHBG, sex hormone–binding globulin. |
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 | Figure 346-5 Evaluation of gynecomastia. T, testosterone; LH, luteinizing hormone; FSH, follicle-stimulating hormones; hCGβ, human chorionic gonadotropin β; E2, 17β-estradiol. |
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 | Figure 346-6 Evaluation of hypogonadism. GnRH, gonadotropin-releasing hormone; LH, luteinizing hormone; T, testosterone. |
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