00:01
So now let's turn our attention to
erection, emission, and ejaculation.
00:05
And on the screen,
we can see the male genitalia.
00:09
We can see the penis.
00:10
We can see the prostate, testes,
vas deferens, and seminal vesicles
associated with the bladder.
00:16
We can also see the contribution
of the sympathetic nervous system
to these organs.
00:22
We can see the testes are
supplied by the renal ganglion,
which is a nod towards the
embrological origin of the testes.
00:29
And we can see the prostate,
the penis, and the seminal vesicles
contribution via the
sympathetic nervous system
of the inferior hypogastric plexus.
00:39
We can also add in the
parasympathetic control
and here we have
parasympathetic control
coming from the
pelvic splanchnic nerves.
00:47
Again, through the
inferior hypogastric plexus.
00:50
Now the interplay between
erection, emission, and ejaculation
is quite a complex one.
00:57
Parasympathetic will
typically take control during
the erection allow the engagement
of blood within the penis.
01:03
Whereas sympathetic
will take control during
ejaculation and the contraction
of bulbospongiosus muscle
to force the semen out for example.
01:12
So it is quite a complex
interplay between
both parasympathetic
and sympathetic,
that control the
erection and ejaculation.
01:20
But erection is typically done by
the parasympathetic nervous system,
and ejaculation by way of
the sympathetic nervous system.
01:28
That similar process will
happen within the female.
01:31
But here we can see you have
the lumbar splanchnic nerves
while the
inferior hypogastric plexus
giving rise to the
sympathetic input
to the uterus, the uterine tubes,
and the vagina.
01:43
And again, similar to the testes,
the ovarian plexus
will be derived from
the renal ganglion
due to the origin of the ovaries.
01:50
Again, we can finally add in the
parasympathetic input,
again, via the
inferior hypogastric plexus
with the pelvic splanchnic nerves
contributing to this plexus.