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Lab Manual Reproductive Male Atlas

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PRELAB EXERCISES
Use the following modules in Visible Body’s Human Anatomy Atlas app to guide your exploration
of the reproductive system. You can manipulate the images to see different views and isolate each
structure. Be sure to select the book icon under the structure name to read information specific to
that structure.
As you explore the modules, locate the organs and related structures on any additional charts,
models, or specimens available.
Make the following observations, and note that you are responsible for all bold terms and diagram labels.
I. MALE REPRODUCTIVE SYSTEM OVERVIEW
To start: Select the Views menu at the top of the screen, then select Systems. Scroll down to
Reproductive System Views at the bottom and select 1. Reproductive System (M).
Penis
Scrotum
1. The external organs of the male reproductive system, the penis and the testes, lie outside the pelvis.
Deselect the skin by choosing the skin icon at the top of the system list on the left (it looks like a head).
Select any part of the penis or scrotum to see the dartos fascia, the connective tissue that surrounds the
external organs.
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Penis
Scrotum
Dartos fascia
2. Hide the dartos fascia and select either of the testicles (testes). This will highlight the spermatic fascia
that cover the testes and continue as tubes over the pubis and into the pelvic cavity.
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Buck's fascia
Bladder
Prostate
Glans penis
Testicle (inside
spermatic fascia)
Spermatic fascia
Vas deferens
3. Deselect the skeletal system (the skull icon) and follow the path of the spermatic fascia to the vas
deferens, over the bladder, and into the prostate.
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Prostate
Bladder
Seminal vesicles
Bulbourethral
(Cowper's) glands
Vas deferens
4. Rotate the view so you can see the paired seminal vesicles attached to the posterior part of the bladder
above the prostate.
5. Locate the bottom of the prostate and note how it attaches to the penis. Zoom in and find the small paired
bulbourethral (Cowper’s) glands. The bulbourethral glands, the prostate, and the seminal vesicles are
accessory glands of the male reproductive system.
TIME TO PRACTICE!
GO TO THE REPRODUCTIVE SYSTEM QUIZZES AND
TAKE QUIZZES 1. OVERVIEW, REPRO. M AND 2. EXTERNAL GENITALIA M.
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II. MALE REPRODUCTIVE SYSTEM TESTICLES AND SPERMATIC CORDS
1. In the Reproductive System menu select Show More, then select 6. Testicles. Select the right
spermatic fascia and hide it. Next, select the right testicle (testis) and read the definition in the content
box.
a. What is the primary purpose of the testes?
b. Testes are the _________________________, the primary male sex organs.
c. What are gametes?
Right testicle
Gonadal
vessels
Spermatic cord
Vas deferens
Spermatic fascia
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d. What is the name for male gametes?
e. Testes also secrete _________________________, a hormone important in the development of male
characteristics.
2. Refresh the model and then hide the skin once more. Look at the sheaths formed by the spermatic
fascia that enter the pelvis via the inguinal canal.
a. What are these sheaths called?
b. What is carried inside these sheaths?
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Vas deferens
Epididymis
Lobule
3. In the Reproductive System menu select Show More, then select 7. Testicle Section. Note the
lobules formed by connective tissue inside the testis.
a. What are contained in these lobules?
4. Sperm cells develop inside these tubules from puberty throughout a man’s life.
a. The male sex cells, sperm, contribute ______________ the genetic information required to form
an embryo.
5. Select the right epididymis, the small banana-shaped gland attached to the posterior region of
each testis. Read the definition and answer the following questions.
a. The epididymis is divided into three regions: the ______________, the ______________, and the
______________.
b. The epididymis collects _____________________________ from the seminiferous tubules.
c. Sperm cells remain in the epididymis for two to three months and, as they mature there, they
acquire the ability to swim and to fertilize an egg. After they leave the epididymis, sperm enter
the ____________________________.
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III. MALE REPRODUCTIVE SYSTEM VAS DEFERENS, SEMINAL VESICLES, AND THE PROSTATE
GLAND
Prostate
Lobes of
prostate
Bulbourethral (Cowper's) glands
Prostatic portion
of urethra
Bladder
Seminal vesicle
1. In the Reproductive System menu select 4. The Prostate. Select one of the vas deferens and follow
its path to the prostate. Rotate the model in order to look at the posterior side of the prostate. Select
the prostate and read the definition in order to answer the following questions.
a. Accessory glands add fluids to the sperm to form seminal fluid, which is ejaculated from the
urethra during sexual activity. The prostate is one of the accessory glands, which are glands
that contribute to the fluid containing sperm, of the male reproductive system. Fluid from the
prostate enters into the prostatic portion of the ___________________________.
b. Prostate fluid contributes ___________________________ and other substances to semen.
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c. Select the right side of the prostate and hide it. Select any of the lobes of the prostate. These
lobes contain ___________________________ tissue.
2. Locate the urethra, the tube that drains from the urinary bladder into the penis. Note that it passes
directly through the prostate. The portion of the urethra that passes through the prostate is called the
___________________________.
3. Select the prostate and then choose the pathology icon in the popup window (the stethoscope) to
see common diseases associated with the prostate. How could an enlarged prostate affect urination?
4. Locate the seminal vesicles, two glands attached to the posterior portion of the urinary bladder.
Locate the spot where the seminal vesicles join with the vas deferens as they enter the prostate.
a. What substances are secreted by the seminal vesicles?
b. What proportion of the seminal fluid is contributed by the seminal vesicles?
c. The vas deferens and the seminal vesicle ducts join to become the
___________________________.
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IV. MALE REPRODUCTIVE SYSTEM EJACULATORY DUCTS AND THE BULBOURETHRAL GLANDS
Ejaculatory
duct
Bulbourethral (Cowper's) gland
Spongy urethra
Corpus spongiosum
Membranous urethra
Prostatic urethra
1. In the Reproductive System select Show More, then select 10. Ducts. Locate the ejaculatory duct,
which carries sperm from the vas deferens, along with seminal vesicle secretions, through the prostate
to the prostatic urethra.
2. Note that the first part of the prostatic urethra carries only urine from the bladder. After the junction
of the ejaculatory duct, the urethra is responsible for carrying both sperm and urine (at different times).
3. Choose the portion of the urethra that lies between the prostate and the penis.
a. What is this called?
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4. Near the membranous urethra are the two paired bulbourethral (Cowper’s) glands. Ducts from
these glands join the urethra below the membranous urethra at the proximal portion of the spongy
portion of the urethra (the spongy urethra).
a. What do the bulbourethral glands secrete?
b. What is the function of this secretion?
5. Select the corpus spongiosum of the penis and hide it. Select the spongy urethra and follow it to
the slightly enlarged ending where the urethra ends externally at the end of the glans penis.
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V. MALE REPRODUCTIVE SYSTEM PENIS
Dorsal artery
of penis
Corpus
spongiosum
Glans penis
Corpus cavernosum
Dorsal superficial
vein of the penis
1. In the Reproductive System select Show More, then select 12. Penis. Note the skin (faded) that
covers the penis. Select the part of the skin that covers the glans penis. Part of it is removed during a
procedure called circumcision.
a. What is it called?
2. Choose the skin icon on the left to hide the skin. Locate the glans penis, the paired corpus
cavernosum, and the corpus spongiosum. The latter two structures are made of spongy tissue that
fills with blood to cause the penis to become erect.
3. Select the muscle (the arm) and skeletal system icons, then hide them. Next, choose the circulatory
system icon (the heart) to show it. Locate the dorsal superficial vein of the penis and the dorsal
artery of the penis. Next locate the paired deep arteries of the penis. The spongy portions of the
penis become engorged with blood from these arteries during sexual arousal and the veins drain the
blood after ejaculation.
4. Rotate the model so that you can see where the urethra exits the body at the tip of the glans penis.
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VI. PELVIS CROSS SECTION
View 3: Pelvis Cross Section
Corpus cavernosum
Prostate
Prostatic capsule
Urethra
Corpus spongiosum
Deep dorsal vein of
the penis
Buck's fascia
In the Cross Section tab scroll down to the Pelvis section and select 3. Pelvis (Symphysis) (M).
Locate the following:
a. Corpus cavernosum
b. Corpus spongiosum
c. Buck’s fascia
d. Deep dorsal vein of the penis
e. Prostate
f. Prostate capsule
g. Urethra
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PUTTING IT ALL TOGETHER
Name the structures through which sperm passes, from the testis to the glans penis.
List the accessory glands that contribute fluid to seminal fluid.
TIME TO PRACTICE!
GO TO THE REPRODUCTIVE SYSTEM QUIZZES AND
TAKE QUIZZES 3. INTERNAL GENITALIA M AND 4. REPRO. DUCTS M.
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Source: Reproductive System Views: View 1 Reproductive System (M)
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Source: Reproductive System Views: View 1 Reproductive System (M)
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Source: Reproductive System Views: View 1 Reproductive System (M)
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Source: Reproductive System Views: View 1 Reproductive System (M)
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Source: Reproductive System Views: View 6: Testicles
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Source: Reproductive System Views: View 7: Testicle Section
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Source: Reproductive System Views: View 4: The Prostate
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Source: Reproductive System Views: View 10: Ducts
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Source: Reproductive System Views: View 12: Penis
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Source: Pelvis (Axial) Cross Sections: View 3 Pelvis (Symphysis) (M)
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Completed 11 February 2021

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