Human Sexual Anatomy Physiology Human Sexuality Psychology 123

Human Sexual Anatomy & Physiology Human Sexuality Psychology 123 - Professor J. B. Pryor

Prenatal Sexual Differentiation Genetic Factors

Initially, there are more males than females

Prenatal Sexual Differentiation Gonads -[become]-> Testes or Ovaries In males, at 7 th week, outer portions of gonads degenerate and inner portions develop into testes In females, at 11 th week, inner portions of gonads degenerate and outer portions develop into ovaries

Prenatal Sexual Differentiation Gonads -[become]-> Testes or Ovaries Testes - endocrine glands that produce • male hormones (androgens) • Mullerian Inhibiting Substance Most changes reflect the presence or absence of androgen

Prenatal Sexual Differentiation Wolfian Ducts - later become • epididymes • vasa deferentia • seminal vesicles

Wolfian Ducts develop into Male Anatomy

Prenatal Sexual Differentiation Gonads -[become]-> Testes or Ovaries- endocrine glands that produce • female hormones (e. g. estrogen)

Prenatal Sexual Differentiation Mullerian Ducts - later become • uterus • fallopian tubes • upper part of vagina

Mullerian Ducts develop into Female Anatomy

Undifferentiated External Genitalia (<7 weeks) urethral fold & groove genital tubercle

Partially differentiated external male & female genitalia

Fully developed male & female external genitalia

Fetal external genitals: female 11 -12 weeks 19 weeks

Fetal external genitals: female 5 months

Fetal external genitals: male 15 weeks 16 weeks

Fetal external genitals: male 5 m o n t h s

Hormonal Changes in Puberty Hypothalamus FSHRF LHRF Anterior Pituitary

Hormonal Changes in Hypothalamus FSHRF Puberty LHRF Anterior Pituitary FSH OVARIES LH ICSH(LH) FSH TESTES

Hormonal Changes in Hypothalamus FSHRF Puberty LHRF Anterior Pituitary FSH LH OVARIES Ovum Growth Ovulation Corpus Luteum Estrogen Progesterone FSH ICSH(LH) TESTES Testosterone Spermatogenesis

Changes in Puberty

Female Sexual Anatomy Two Plates by Judy Chicago

External Female Sexual Anatomy Vulva Mons Labia Majora Labia Minora Bartholin’s Glands Clitoris • inside - 2 corpora cavernosa Hymen

clitoris mons labia majora labia minora vestibule Bartholin’s glands External Female Anatomy

Clitoris

Variations in Labia

Internal Female Anatomy Ovaries Uterus - back - fundus - front - cervix Layers of Uterus • perimetrium • myometrium • endometrium

Ovaries & Fallopian Tubes fundus fallopian tube ovary uterine cavity cervix top of vagina

Close-up of an ovary

U t e r u s endometrium myometriun perimetrium cervix vagina