So we have now got
the sperm running
through the ductus deferens.
They runs through the ductus deferens. They enter the
inguinal canal via the superficial inguinal ring.
They then run along the inguinal canal to
enter the pelvis via the deep inguinal ring.
And we can pick them up
running alongside the bladder.
So here the posterior view of the
bladder. We have got the posterior
view of the bladder. We can just see the apex at
the top going to the anterior abdominal wall.
And running down we
have got the ureters
coming from the two kidneys we
have got the uterus running down
And sweeping around the bladder we can
find we have got our ductus deferens.
Notice how they run over the bladder
or the bladder runs under the ductus
deferens we can see them here.
Obviously we have two testes
one on either side
in the scrotum so we
have two ductus deferens.
As the run along the posterior surface
of the bladder they become dilated
and that's what we call the
ampulla of the ductus deferens.
And here, the ampulla of
the ductus deferens
runs alongside at
an important gland
and this gland is known as the
seminal vesicle or the seminal gland.
And the seminal vesicle, the
seminal glands produce the semen
produce the environment that is
helpful, that is friendly for the sperm
to survive in, prior to ejaculation and then
[inaudible 0:23:51.880] them in the vaginal vault,
hopefully passing through the
cervix for reproduction to occur.
So we have the seminal glands here. If we
look at this diagram on the opposite side
we can see that we have the
prostatic part of the urethra
indicated here in yellow. So that's
the prostatic part of the urethra.
And that's going to carry on extending all the way
down towards the membranous part of the urethra here.
And what we can see is that we have got our prostrate.
The urethra passing through the prostrate
and we can see this seminal vesicle
and we can see our vas deferens.
And the opening for the
seminal vesicle combines
with the vas deferens to
form an ejaculatory duct.
This ejaculatory duct crosses through
the substance of the prostate
to open up into the
So here we have got
the prostatic urethra
and we can see that the ejaculatory
duct is opening up into it.
This is how the semen can
then be expelled from the body
by passing into urethra
that runs through the penis.
So we have got the ureters entering
into the bladder which we can see here.
The important point is the relationship
the ureters have to the ductus deferens
and ureters run underneath the
ductus deferens or the vas deferens.
The ductus deferens occur at
the start of the epididymis
so where you have the tail of the epididymis
then the ductus deferens continue.
The ductus deferens they enters
the pelvis by crossing the
iliac vessels and they
run over the ureters.
As they approach the
seminal vesicles they dilate
and form the ampulla.
The ampulla then combines
with the seminal vesicles
to form the ejaculatory duct.
The seminal vesicles are important in
secreting this thick alkaline fluid.
This is important because the environment
of the vagina is quite acidic
and the alkaline help to
neutralize that environment.
The ejaculatory ducts are then the
slender tubes that pass
through the substance of the
prostate and they open
on the seminal colliculus.
This is an elevation of
the prostatic urethra.