Neural and Hormonal Activation of Sexual Behavior - Males Flashcards Preview

COGS17 - Final > Neural and Hormonal Activation of Sexual Behavior - Males > Flashcards

Flashcards in Neural and Hormonal Activation of Sexual Behavior - Males Deck (13):
1

Neural and Hormonal Activation of Sexual Behavior

All depend on pre-established “Organizing Effects”

2

Medial Preoptic Area (MPOA)

Where?

of Hypothalamus, including Sexually Dimorphic Nucleus, is critical for sexual behavior

3

Testosterone generally required for

rousal (e.g. castration>decrease), although can vary with learned experience

4

MPOA

Releases GnRH >

Releases Dopamine in response to sexual stimulus

Connects to Tegmentum and Basal Ganglia

Also signals Posterior Pituitary to release Oxytocin (at time of orgasm)

producing Refractory Period before male can respond again

5

release of GnRH >

> Anterior Pituitary releases LH & FSH > Testes release Testosterone

6

Prolactin

released by Anterior Pituitary after ejaculation

producing Refractory Period before male can respond again

7

Nucleus Accumbens

Pleasure!

near Basal Forebrain

- Area also implicated in addiction to amphetamines, cocaine, and chocolate; Rats will stimulate area to death

8

Spinal Nucleus of the Bulbocavernosus (SBN)

- Motor neurons of SBN => rhythmic contractions for ejaculation

-Tegmentum and Basal Ganglia communicate with it

9

Oxytocin

released at time of orgasm

10

MPOA also responds to circulating Testosterone,

increasing its output (short-term positive feedback)

....to input from Medial Amygdala, implicated in Aggression

…to input from Cerebral Cortex (Learning plays a greater role in human sexual activity than in nonhumans)

11

Some correlation between high Testosterone

and Aggression (as in violent crime, tho not nec sexual crime)

12

Medial Amygdala also likely receives

Pheromone input, as well as Somatosensory info from genitals

– In rodents, smell can inhibit aggression toward females, increase aggression toward rival males

13

input from Cerebral Cortex (Learning plays a greater role in human sexual activity than in nonhumans)

- Includes Sensory (including visual identification), Memory, Prefrontal evaluation, and Motor organization

- Can lead to idiosyncratic partner-, place- or object-specific sexual responses