|
|
|
LBB 3 Mens Bodies.ppt
LBB_3_Mens_Bodies.ppt
Showing 29-42 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 29
Figure 3.6
Sensory innervation of the penis
Page 30
The male reproductive tract
Page 31
Penile Erection Involves Nerves, Blood, and Chemistry
The corpora cavernosa consist of collapsible
spaces (sinusoids) that collect blood.
Erections occur when the nervous system
causes the arteries of the penis to expand
and the veins to contract. The
neurotransmitter involved in triggering
erections is nitric oxide.
Priapism, an erection that won’t go down,
may damage erectile tissue.
Page 32
Figure 3.7
Cross section of the penis
Page 33
Figure 3.8
Priapism
Page 34
Penile Erection Involves Nerves, Blood, and Chemistry
Pelvic floor muscles also contribute to
erections.
Erections spontaneously accompany the
REM phase of sleep, regardless of dream
content.
The dreams may be erotic and culminate in
nocturnal orgasms, or nocturnal emissions
(wet dreams). Women may also
experience orgasms during sleep.
Page 35
Figure 3.9
Penile erections accompany REM sleep
Page 36
Anatomy of the scrotum
and testicles
The scrotum contains the two testicles
(testes).
The testes secrete hormones and manufacture
sperm.
Leydig cells
testosterone
Sertoli cells
peptide hormones and control
sperm development.
Seminiferous tubules are the site of
spermatogenesis and dominate the structure of
the testes.