Xy testes begin to differentiate seminiferous tubules

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XY: testes begin to differentiate; seminiferous tubules (细精管)o11 / 12 weeks: XX: ovaries begin to differentiate and form;Sex Hormones and Sexual DifferentiationoMaleAndrogens雄性激素: male sex hormonesTestosterone睾丸素Fosters development of male sex characteristicsConnected with the sex driveSpurs differentiation of male (Wolffian) duct systemDihydrotestosterone(DHT): influence the development of external genitalsMullerian-inhibiting substance(MIS): avoid to develop female duct systemoFemaleSmall amount of androgen produced in female fetuses(胎儿)Mullerian ducts evolve into fallopian tubes, uterus, upper 2/3 of the vaginaFemale sex hormones are not involved in fetal sexual differentiationDescent of the Testes and Ovarieso10 weeks: they are almost even with the upper edge of the pelvisOvaries remain there for the rest of the prenatal periodo4 months: testesscrotal sac through the inguinal canal(腹股沟管), which then closesoCryptorchidism(隐睾病)Sex Chromosome AbnormalitiesoKlinefelter’s syndrome: condition that affects about one in 500 malesGive an extra X sex chromosomeXXYMen fail to develop appropriate secondary sex characteristicsinfertileoTurner’s syndrome: condition that affect about one in 2500 femalesHaving only one X sex chromosomeFemales may not naturally undergo pubertyneed hormone treatmentoBrain, like the genital organs, undergoes prenatal sexual differentiationGender IdentityA person’s internal psychological sense of being male, female, or any other shade of gender
Assigned sex: the classification of anatomic sex given at birth as either male, female, intersexMost people are cisgender: gender identity that matches assigned sexMost children (18 months): aware of their assigned sexMost children (36 months): acquired a firm sense of gender identityNature and NutureoGender identity is usually consistent with chromosomal genderoIn western culture, societal rigiditygender binary (strictly either male / female)Represents a socially prescribed way of classifying gender in our cultureDoes not accurately reflect the diverse range of gender identities actually existoIntersex individuals who possess(拥有) the gonads of one anatomic sex and externalgenitalia(生殖器) that are ambiguous or typical of the other anatomic sexLess rare (one in 5000); have testes or ovaries, but not bothGonads match their chromosomal sexoHermaphrodite雌雄同体: identities & roles of the genders-assigned at birthQuite rareoCongenital adrenal hyperplasia (CAH)Most common female intersex conditionXX female: female internal sexual structures and male external genitalsCaused by high levels of androgensFemale with CAHShowed more interest in masculine-typed toysMore likely to have boys as playmates and want male-typed careersoAndrogen insensitivity syndromeXY males have experienced lower-than-normal prenatal sensitivity to androgens

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Term
Fall
Professor
FISHER
Tags
Human Sexuality, Sexual intercourse, Sexual Health Education, 2nd Exam Notes Textbook

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