Anatomy Series, Male Urethra, Vas Deferens and Ejaculatory Duct by Dr. Shakti Chandra
Summary
TLDRThis educational video offers an in-depth exploration of the male urethra and its associated structures. It visually demonstrates the course of the vas deferens, the location of ejaculatory ducts, and the function of bulbourethral glands. The video dissects the anatomy of the male reproductive system, highlighting the prostatic, membranous, and penile urethra, and explains the formation of the ejaculatory duct. It also provides a clear view of the vas deferens, seminal vesicles, and prostate, along with the surrounding pelvic structures, to deepen the understanding of the male urogenital system.
Takeaways
- 📚 The video demonstrates the male urethra and associated structures using specimens.
- 🔍 It points out the location of the openings of the ejaculatory ducts and the bulbourethral glands.
- 🌟 The video provides an unobstructed view of the vas seminal vesicles and prostate.
- 📏 The urethra is approximately 18 to 20 centimeters long and is divided into three parts: prostatic, membranous, and spongy.
- 📍 The urethra begins at the base of the bladder, passes through the prostate and penis, and ends at the external urethral meatus.
- 🧵 The video shows the course of the vas deferens from its beginning at the tail of the epididymis to its end at the prostate.
- 💧 The membranous urethra is the shortest and least part of the urethra, where the vas deferens joins with the duct of the seminal vesicle to form the ejaculatory duct.
- 🦵 The gluteal region is shown with landmarks such as the ischial tuberosity and pubic ramus, with the pelvic outlet clearly visible.
- 🧬 The video explains the structure of the spermatic cord and the presence of the vas deferens, which has a thick wall and narrow lumen.
- 💉 The testicular vessels, which traverse the inguinal canal, are identified in the video.
- 🔪 In a sectioned specimen, the prostate is shown with the urethra and ejaculatory ducts, and the seminal vesicle and vas deferens are also visible.
Q & A
What structures does the video demonstrate in the male urethra and associated areas?
-The video demonstrates the entire male urethra, ejaculatory ducts, bulbourethral glands, vas deferens, seminal vesicles, prostate, and the external urethral meatus.
What is the length of the male urethra as mentioned in the video?
-The male urethra is about 18 to 20 centimeters long.
How many parts is the urethra divided into and what are they called?
-The urethra is divided into three parts: the prostatic urethra, the membranous urethra, and the spongy or penile urethra.
What is the narrowest part of the urethra?
-The external urethral meatus is the narrowest part of the urethra.
What is the purpose of the membranous urethra and where is it located?
-The membranous urethra extends from the prostate to the bulb of the penis, passing through the urogenital diaphragm and the perineal membrane.
What are the structures that form the pelvic diaphragm?
-The pelvic diaphragm is formed by muscles and connective tissue that support the pelvic organs.
What is the function of the vas deferens as described in the video?
-The vas deferens transports sperm from the epididymis to join with the duct of the seminal vesicle to form the ejaculatory duct.
What is the location of the colliculus in relation to the urethra?
-The colliculus is a midline swelling in the urethra where the openings of the ejaculatory ducts are located.
What is the Tunica vaginalis and its relation to the testes?
-The Tunica vaginalis is a serous membrane that covers the testes and is a remnant of the peritoneum.
What are the testicular vessels and their function?
-The testicular vessels are blood vessels that supply blood to the testes and traverse the inguinal canal.
What is the ampulla and its significance in the vas deferens?
-The ampulla is a dilated part of the vas deferens where sperm are stored before ejaculation.
Outlines
🔍 Male Urethra and Associated Structures Overview
This paragraph introduces a video that provides a detailed look at the male urethra and its associated structures. The speaker plans to demonstrate the location of various openings, including the ejaculatory ducts and the bulbourethral glands, even though the latter may not be visible. Viewers are reminded of structures seen in previous videos and are promised an unobstructed view of the vas deferens, seminal vesicles, and prostate. The video begins with an anatomical orientation, identifying key landmarks such as the anterior abdominal wall, pubic symphysis, sacrum, and coccyx. It then describes the length and parts of the urethra, including the prostatic, membranous, and spongy sections, and their respective functions and anatomical positions.
📐 Deeper Exploration of Male Reproductive Anatomy
The second paragraph continues the exploration of male reproductive anatomy, focusing on the deeper structures not visible in the initial overview. The speaker discusses the pelvic outlet and the pelvic diaphragm, which have been removed to expose deeper structures. The inferior rectal nerves and their function are mentioned, as well as the relationship between the prostate, seminal vesicles, vas deferens, and bladder. The vas deferens is highlighted as it travels from the epididymis tail, through the spermatic cord, and across the midline, joining with the seminal vesicle duct to form the ejaculatory duct. The speaker also touches on the tunica vaginalis, tunica albuginea, and the location of the deep inguinal ring, inviting viewers to identify certain vessels. The paragraph concludes with a demonstration of the bladder and prostate, showing the urethra and ejaculatory ducts, and ends with questions for the viewers to consider.
Mindmap
Keywords
💡Urethra
💡Ejaculatory ducts
💡Bulbourethral glands
💡Vas deferens
💡Seminal vesicles
💡Prostate
💡Membranous urethra
💡Corpus spongiosum
💡Tunica albuginea
💡Epididymis
💡Colliculus
Highlights
Demonstration of the male urethra and associated structures using specimens.
Identification of the openings of the ejaculatory ducts and the bulbourethral glands.
Unobstructed view of the vas seminal vesicles and prostate in situ.
Course of the vas deferens from its beginning to its end.
Description of the urethra's length and its narrowest part, the external urethral meatus.
Division of the urethra into three parts: prostatic, membranous, and spongy.
Location of the openings of the bulbourethral glands in the spongy urethra.
Anatomy of the gluteal region with focus on the pelvic outlet.
Removal of the pelvic diaphragm to expose deeper structures.
Formation of the ejaculatory duct from the vas deferens and duct of the seminal vesicle.
Examination of the unplastered specimen with focus on the testes, spermatic cord, and prostate.
Physical characteristics of the vas deferens, including its cord-like structure.
Junction of the vas deferens with the seminal vesicle to form the ejaculatory duct.
Identification of the Tunica vaginalis and its relation to the testes.
Location and function of the epididymis in relation to the testes.
Identification of the deep inguinal ring and associated testicular vessels.
Anatomical relationship between the ureter and vas deferens posterior to the peritoneum.
Sectioning of the prostate to expose the urethra and ejaculatory ducts.
Observation of fluid release from the seminal vesicle and ejaculatory ducts.
Description of the colliculus, a midline swelling in the urethra related to the ejaculatory ducts.
Transcripts
[Music]
in this video I will use a few specimens
to demonstrate the entire male urethra
and associated structures I will point
out the location of the openings of the
ejaculatory ducts and the bulb or
urethral glands even though you cannot
see the glands you may have seen parts
of these structures in the video on the
male urogenital system you will get an
unobstructed view of the vas seminal
vesicles and prostate in situ last but
not least you will follow the course of
the vas deferens from its beginning to
its end we are looking at the right half
of body 2 which was Hemis acted in the
mid sagittal plane for orientation note
the anterior abdominal wall the pubic
symphysis the sacrum and the coccyx this
is the bladder here is the prostate and
this structure behind the prostate is
the rectum the urethra is about 18 to 20
centimeters long it begins at the base
of the bladder passes through the
prostate the penis and ends at the
external urethral meatus that by the way
is its narrowest part the urethra is
divided into three parts the first part
is the prostatic urethra and the
ejaculatory ducts open here the second
part of the urethra extends from the
prostate to the bulb of the penis since
it passes through the urogenital
diaphragm and the perineal membrane it
is called the membranous urethra this is
the shortest and the least
part of the urethra the third part of
the urethra traverses the corpus
spongiosum and his hands call the spongy
or the penile urethra located here are
the openings of the bellboy urethral
glands we will now move on to body 1 we
are looking at the gluteal region
note the ischial tuberosity sacral
tuberous ligament coccyx and the sto
pubic ramus you can see the pelvic
outlet clearly as I removed most of the
pelvic diaphragm do you recall what
forms the pelvic diaphragm i've also
removed the rectum and the anal
sphincter to expose these other deeper
structures these by the way are the
inferior rectal nerves which were going
to the external anal sphincter here is
the prostate the seminal vesicle and the
vas deferens you can also see the
bladder it's about at this point that
the vas joins with the duct of the
seminal vesicle to form the ejaculatory
duct which opens into the prostatic
urethra this is the membranous urethra
we will now move on to an unplastered
specimen this specimen was removed from
an unembodied our note the testes
spermatic cord the rectum bladder and
the prostate
in the spermatic cord i can feel this
cord like structure which is the vas
deferens
it feels cord like because of a thick
wall and narrow lumen the vas begins at
the tail of the epididymis goes up in
the spermatic cord goes through the
inguinal canal changes direction and
goes across towards the midline it
crosses the ureter close to the base of
the bladder and then it joins with the
duct of the seminal vesicle to form the
ejaculatory duct opening into the
prostate as I press on the seminal
vesicle and the prostate you can perhaps
see little fluid losing out of the
urethra reflecting the Tunica vaginalis
which is remains of the peritoneum to
expose the testers this part here thick
membrane is the tunica albuginea this is
the epididymis which is loosely attached
to the testes not the head the body and
the tail of the epididymis the tail is
continuous with the vas you can note the
narrow lumen of the vas also called the
ductus deferens this here is the about
the location of the deep and winel ring
and at this point there are these two
vessels you might be able to see them
faintly which join on to the vas can you
name those vessels give you a hint they
traverse the inguinal canal those are
the testicular vessels this other
structure here
the ureter note that the ureter as well
as the vas both are posterior to the
peritoneum I would like to show you one
more specimen this is the bladder and
here is an enlarged prostate I section
the prostate to expose the urethra this
is the urethra and you can see these two
ejaculatory ducts opening into the
prostatic urethra this is the seminal
vesicle and here is the vas deferens
this dilated part of the vas is called
the ampulla it is here that the sperms
are stalled as I press on the seminal
vesicle may be able to see some fluid
come out through this ejaculatory ducts
which are cut the openings of these
ducts are located on either side of a
midline swelling in the urethra that
swelling is called the colliculus here
are a few questions for you
you
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