In this lecture, I’m going to describe the
accessory ducts and also the glands associated
with the male reproductive system. It’s
important at the end of this lecture that
you are able to identify each of the duct systems
and know what role they have in transporting
sperm from the testes to the penis. I want
you to understand and identify the different
sorts of accessory glands, the prostate, seminal
vesicle, and also their role in nourishing
and protecting the sperm after ejaculation.
You should all have a good understanding also
of the structure of the penis and how blood
flow going to the penis creates an erection.
These ducts are very important because they
store the mature spermatozoa. The glands add
secretions to the ejaculate to provide the
nourishment for those spermatozoa in the ejaculate.
And it’s important to understand the structure
of the penis as an organ of copulation in
the male, and also, the organ that delivers urine
outside the body. It contains the urethra.
And the urethra is a common conduit for delivering
not only urine but also the ejaculate.
This slide illustrates the major organs of the
male reproductive system. And I’ve listed those
organs on the left-hand side of the slide.
I’ve already described the testis in a separate
lecture. In this lecture, I’m going to
concentrate on the other structures listed.
Just look at the diagram and locate the testis.
It’s a green circular structure suspended
in the scrotum towards the base of the section
of the slide. The bluey stained or colored
component wrapping itself around, that posterior
aspect of the testis is the epididymis, the
ductus epididymis. And then that’s continuous
with a long tube you see running up around
the back of the bladder, that’s the vas or ductus
deferens. And that joins both the seminal
vesicle and the prostate gland which are the
two major accessory glands I’m going
to describe. And then, the delivery of both urine
and also spermatozoa from the vas deferens
is delivered into the urethra. You can see
the urethra initially coming from the bladder.
The urethra passes down through the prostate,
and then through a membranous component between
the prostate before it enters the penis. So
the urethra has both a prostatic component,
a membranous component, and also a penile
component. You can also see the ejaculatory
ducts coming from the seminal vesicle, passing
into the prostate gland. It’s important
to understand the relationships of all these
organs that I’ve just described, so that
when we go through these organs in more detail,
you’re aware of their relationship and the
interaction each has with each other.