Updated for 1999
Lecture Notes
Chapter 10 - Reproduction

2 ROLES OF SEX HORMONES:

1)  organizational effects - permanent, influence brain and sex organ development
2)  activational effects - occur later in life, after development of sex organs

SEX ORGAN

gonads - testes or ovaries, first to develop

internal sex organs - precursors for male and female present in embryo

external genitalia - visible sex organs; masculine develop requires presence of androgens DEVELOPMENT OF SECONDARY SEX CHARACTERISTICS HORMONAL CONTROL OF SEXUAL BEHAVIOR MALE LABORATORY ANIMAL SEXUAL BEHAVIOR

Coolidge effect - restorative effect of introducing a new female sex partner to a male that has apparently become "exhausted" by sexual activity

FEMALE LABORATORY ANIMAL SEXUAL BEHAVIOR

PHEROMONES Pheromones in humans: SEXUAL ORIENTATION NEURAL CONTROL OF SEXUAL BEHAVIOR IN MALES

1) spinal nucleus of the bulbocavernosus - in ventral horn of lumbar region of spinal cord of rats

2) medial preoptic area - forebrain region most critical for male sexual behavior 3) medial amygdala - receives info from olfactory bulbs and vomeronasal organ NEURAL CONTROL OF SEXUAL BEHAVIOR IN FEMALES Maternal behavior Paternal behavior