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LBB 3 Mens Bodies.ppt
LBB_3_Mens_Bodies.ppt
Showing 140-147 out of 148
LBB 3 Mens Bodies.ppt-Men’s Bodies LeVay, Baldwin ...
LBB_3_Mens_Bodies.ppt-Men’s Bodies LeVay, Baldwin & Baldwin,
LBB 3 Mens Bodies.ppt-Men’s Bodies ...
LBB_3_Mens_Bodies.ppt-Men’s Bodies LeVay, Baldwin & Baldwin,
Page 140
Effects of chemical
castration
Used to treat sex offenders
Medroxyprogesterone acetate (MPA):
decreases T levels
Cyproterone acetate (CPA): blocks
androgen receptor binding
Study with MPA: decreased T levels by
68%, but did not decrease engorgement
in response to erotic images; however, it
did decrease self-perceived arousal and
fantasies
Page 141
In another study, rapists and nonrapists
watched a pornographic film
Both groups became sexually aroused
However, the rapists, but not the
nonrapists, became aroused when the
women appeared to be experiencing
displeasure
Rapists and nonrapists do not differ in their
average blood concentrations of androgens
Page 142
Summary
In many species: Males compete,
females choose
Appetitive behavior
Proximity, territory, songs, inter-male
agg.
Consummatory behavior
Mount, Intromission, Ejaculation
Postejaculatory behavior
“Song,” sleep-like EEG, Coolidge effect
Page 143
Summary
Structures in penis
Corpora cavernosa (pl)
(corpus cavernosum,
singular)
Corpus spongiosum
Glans, shaft
Structures in testes
Seminiferous tubules
Epididymis
Vas deferens from epididymis to ejaculatory
duct
Page 144
Summary
Erection: parasympathetic NS
NO
vasodilation & muscle relaxation
Also ischiocavernosus & bulbospongiosus muscles
contract to increase pressure
Ejaculation: sympathetic NS
norepinephrine
contracts muscles in vas deferens, closes
sphincter to bladder, causes rhythmic muscle
contractions in pelvic floor muscles
Oxytocin stimulates smooth muscle
contractions and in brain
pleasure.
Page 145
Summary: Neural
mechanisms
Spinal reflexes for erection &
ejaculation, but those are
controlled by the brain.
Main & accessory (vomeronasal)
olfactory bulbs
amygdala
MPOA
autonomic and motoric
outputs
Page 146
Summary
“Lower” organisms: stereotyped
copulation
Humans & Bonobo chimps: much
more variable behaviors
Men:
Variable dependence on
hormones
Page 147
Review Questions
1. What is circumcision?
2. What are the corpora cavernosa?
3. What is the corpus spongiosum?
4. What are the seminiferous tubules?
What is their function?
5. What is the epididymis?
6. What are the functions of the Sertoli cells?
the Leydig cells?
7. What is the location and function of the prostate gland?
8. What is the main contribution of the seminal vesicle?
9. What keeps the penis flaccid when a male is not sexually
aroused?
(Sympathetic or parasympathetic nervous system?
What does it do?)
10. How is an erection produced?
11. What is the role of nitric oxide (NO)?
12. How do Viagra, Cialis, & Levitra work?
13. How is ejaculation produced?
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