Anatomy of the Male Reproductive System Flashcards
What is the temperature of the testis, and what is it essential for?
- 3-5 °C
- essential for: sperm production
What does the body of the penis composed of?
3 cylinders of erectile tissue enclosed in a tubular sheath of fascia (Buck)
What is the function of the ejaculatory ducts?
drain seminal fluid into the prostatic urethra
What covers the epididymis?
TUNICA VAGINALIS covers it with the exception of the posterior border
What does the parietal layer of the scrotum cover?
the inner aspect of the scrotal wall
Describe the epididymis?
single long coiled duct that courses align the posterolateral side of the testis
what is the testes venous drainage?
pampiniform plexus, they combine and form testicular vein
What functions does the cremasteric reflex has?
protective and thermoregulatory testicular functions
What are the structures contained inside the scrotum?
external spermatic fascia
testes
epididymis
spermatic cord
Where do the testes develop, and where do they move into?
develop in the abdomen and move into the scrotum before birth
What is the lymphatic drainage of epididymis?
Para-aortic lymph nodes
What is the erectile tissue made up of?
two dorsally placed corpora cavernosa and a single corpus spongiosum applied to her ventral surface.
What arteries play a significant role in supplying blood to the scrotum?
- external PUDENDAL branches arising from the femoral arteries
- SCROTAL branches of the internal pudendal arteries
The bulb of the penis is proximal and anchored to?
proximal to corpus spongiosum
anchored to: perineal membrane
What veins drain the penis?
Drain into the internal pudendal veins.
Where does the contents of the scrotum drains (lymphatic drainage)?
drain to the lumbar lymph nodes
Where does the ejaculatory duct penetrate through?
PROSTATE GLAND to connect with the prostatic urethra
(anterior innervation) cremaster muscle and anterior scrotum are innervated by?
genitofemoral nerve (L1-L2 segments of the lumbosacral plexus)
What is the innervation of the testes?
lesser splanchnic nerve (T10) & genital branch of genitofemoral nerve
Where is the scrotum located?
thin external sac that is located under the penis
What is the nerve supply of the penis, sensation and erectile?
Sensation: Pudendal Nerve & Pelvic Plexuses
Erectile:
• Parasympathetic (excitatory)
• Sympathetic (inhibitory)
All arterials that supply the penis are branches of?
INTERNAL PUDENDAL ARTERY
What is the testis path, and how does it help in lymphatic drainage?
- testes migrate from the abdominal wall through the inguinal canal and into the scrotum
- the testis will drag its blood supply and lymph vessels into the scrotal sac
What does the visceral layer of the scrotum coat?
the testis and epididymis
What is the venous drainage of the epididymis?
Pampiform Plexus that reduces into a single vein that ascends through the inguinal canal.
Testes arterial blood supply?
testicular arteries, stem from abdominal aorta
What nerves innervate the cremasteric reflex?
ilioinguinal
genitofemoral nerves
What is the testes lymphatic drainage?
para-aortic lymph nodes
What innervates the pudendal?
posterior innervation
What are the testes covered by?
TUNICA VAGINALIS
TUNICA ALBUGINEA: a fibrous capsule
Describe ejaculatory ducts..
- less than 1 inch long
- formed by: union of Vas Deferens, and duct of seminal vesicle
- pierve posterior surface of prostate and open prostratic part of urethra
Where is the prostate located?
- Inferior: to bladder
- above: to urogenital diaphragm
- posterior: to pubic symphysis
- anterior: torectum
Structures of prostate?
Enclose within thin dense fibrous capsule.
Inner loose sheat derived from pelvic fascia.
Arterial blood supply for penis?
corpora cavernosa: deep arteries of the penis
corpus spongiosum: artery of the bulb
dorsal artery of the penis
What is the lymph drainage of the penis?
skin of the penis: medial group of superficial inguinal nodes
deep structures: internal iliac nodes.
Where does the wall of the scrotum drains (lymphatic drainage)?
into the superficial inguinal lymph nodes
At its distal extremity the corpus spongiosum expands to…
to form the gland penis which covers the distal ends.
What is the scrotum composed of?
skin and smooth muscle
What is the terminal part of the vas deferens?
dilated to form the AMPULA OF THE VAS DEFERENS
What is the penis?
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Pendulous organ suspended from the front and sides of the pubic arch and containing the greater part of the urethra.
What is the scrotum wall thickness?
8 mm
What is the left testis level?
lies at lower level
What is the function of the scrotum?
- protect the testes
- helps with thermoregulation
- keeps testis temperature
What is the ductus deferens?
Long muscular duct that transports the spermatozoa from the tail of the epididymis to the ejaculatory duct.
The root of the penis consits of?
2 crura: they are proximal of corpora cavernosa
attached to: pubic arch & bulb of penis
What shape are the testes?
Ellipsoid shape
What is the epididymis arterial blood supply?
Testicular Artery, branch of the Abdominal Aorta
