30 Questions
What is the main function of the epididymis?
To store sperm
What is the terminal part of the vas deferens dilated to form?
Ampulla of the vas deferens
Which of the following structures does the vas deferens cross on the side wall of the pelvis?
All of the above
What is the main blood supply to the scrotum?
External pudendal artery
Where is the seminal vesicle located?
Behind the base of the bladder
What is the prostate gland responsible for?
Producing seminal fluid
What is the main function of the seminal vesicle?
To contribute significantly to the volume of seminal fluid
What is the effect of senile enlargement of the prostate gland?
Decreased urinary output
What is formed by the union of the vas deferens and the duct of the seminal vesicle?
Ejaculatory duct
What is the shape of the prostate?
Conical
What is the function of the seminal vesicles?
To produce seminal fluid
What is the apex of the prostate related to?
Superior fascia of the urogenital diaphragm
What is the common site of metastasis of cancer prostate?
Bones
What separates the posterior surface of the prostate from the rectum?
Rectovesical fascia
What is the location of the posterior lobe of the prostate?
Behind the prostatic urethra and below the 2 ejaculatory ducts
What is the function of the prostatic venous plexus?
It drains the prostate and empties into the internal iliac veins
What is the usual site for senile enlargement of the prostate?
Right and left lateral lobes
What is the origin of the nerve supply to the prostate?
Inferior hypogastric plexus
What is the usual route of spread of cancer prostate?
Via lymphatic route
What are the components of the male external genital organs?
Scrotum, testis, epididymis, spermatic cord
What is the function of the Cremasteric muscle?
To elevate the testis close to the body
What is the location of the median lobe of the prostate?
Between the upper part of the prostatic urethra and ejaculatory ducts
What is the purpose of the levator ani?
To pierce the posterior surface of the prostate
Which fascia is continuous with the deep membranous layer of the ant.abd.wall?
Colle's fascia
What is the length of the uncoiled epididymal tube?
6 meters
What is the origin of the Cremasteric muscle?
Internal oblique and supplied by genital branch of genitofemoral nerve
What is the function of the Tunica vasculosa?
To provide a vascularized layer to the testis
What is the artery that supplies the testis?
Testicular artery from the abdominal aorta
What is the direction of the lymphatic drainage of the testis?
Pre-aortic and para aortic L.N.
What is the name of the reflex that occurs when the cremasteric muscle contracts?
Cremasteric reflex
Study Notes
Male Genital System
Scrotum
- Consists of superficial fascia, which includes:
- Superficial fatty layer replaced by Dartos muscle
- Deep membranous layer (Colle's fascia) continuous with deep membranous layer of ant. abd. wall (Scarpa's fascia)
- Lymphatic drainage → Superficial inguinal LN
Testis
- Oval shape
- Coverings: 3 coats from outside inwards:
- Tunica vaginalis: has visceral and parietal layers, covers the whole testis except posterior border
- Tunica albuginea: fibrous coat all around testis
- Tunica vasculosa: innermost vascularized C.T.
- Blood supply: Testicular artery from abdominal aorta
- Venous drainage: Pampiniform plexus of veins → testicular v. → Rt. testicular vein → Inferior Vena Cava, Lt. testicular vein → Left renal vein
- Lymph drainage: Pre-aortic & para-aortic L.N.
Epididymis
- Forms a cap on the upper pole of testis, descends lateral to posterior border till its lower pole
- Highly coiled duct, approximately 6 meters long when uncoiled
- Parts:
- Head: forms a cap on the upper pole of testis
- Body: formed of a single coiled tube
- Tail: lower end of epididymis, continues as the vas deferens
- Function: reservoir for sperms
Spermatic Cord
- Constituents: vas deferens, duct of seminal vesicle, and nerves
- Coverings: spermatic fascia, cremasteric fascia, and external spermatic fascia
Vas Deferens
- Begins at the epididymis, crosses the ureter, and descends medial to seminal vesicle
- Terminal part is dilated to form the ampulla of the vas deferens, which joins the duct of seminal vesicle to form the ejaculatory duct
Prostate Gland
- Conical shape, with a base above, an apex below, and 4 surfaces (anterior, posterior, and 2 inferolateral)
- Position: lies immediately inferior to the neck of the bladder and anterior to the rectum
- Lobes: divided into 5 lobes by the urethra and the 2 ejaculatory ducts:
- Anterior lobe
- Posterior lobe (usual site for cancer)
- Right and left lateral lobes (usual site for senile enlargement)
- Median lobe
- Blood supply: branches from inferior vesical, middle rectal, and internal pudendal arteries
- Veins: prostatic venous plexus drains into internal iliac veins
- Lymph drainage: internal iliac nodes and sacral lymph nodes
- Nerve supply: from inferior hypogastric plexus
- Clinical note: a venous communication is present between prostatic venous plexus and internal vertebral venous plexus, explaining why cancer prostate usually sends metastases to the vertebral bodies.
This quiz covers the anatomy of the male genital system, including the scrotum, testis, epididymis, and spermatic cord. Learn about their layers, blood supply, lymphatics, and functions.
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