HMB200H1 Lecture Notes - Lecture 15: Sexually Dimorphic Nucleus, Olfaction, Preoptic Area
Document Summary
Medial preoptic area (mpoa) is the sexually dimorphic nucleus. Highest expression of estrodial receptors triggers puberty and sexual interest. Brain regions for sexual behaviour. Behavior of females internal (estrus) hormones that influence receptivity hypothalamic and hormonally driven. Where lordosis activating neurons go to spinal cord and brain stem to produce this fixed posture. Interstitial nucleus of the anterior hypothalamus (inah: differences compared between heterosexual females and heterosexual males. Females tend to have a small nucleus; males tend to have a darker and larger nucleus. Inah- 3 differences in some male homosexuals: bnst differences in a few transgendered males, gay gene xq28 not supported, however. Single gene that causes homosexuality has not been supported. Homosexual male brains had smaller nucleus inah3 large cluster of aids victim with smaller nuclei. Bnst is an amygdala connected structure (part of limbic system) connects medial amygdala with medial preoptic area. Central subdivision (has most of the estrodial receptors) of bnst.
