156, 157. Anatomy of the male reproductive system Flashcards Preview

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Flashcards in 156, 157. Anatomy of the male reproductive system Deck (18):

What are the 3 types of accessory glands of the male reproductive system and how many of each are present?

1. Bulbourethral gland - 2
2. Prostate gland - 1
3. Seminal vesicles - 2


List the layers of the scrotum, from skin to inner spermatic fascia

Dartos muscle
External spermatic fascia
Cremasteric muscle
Inner spermatic fascia


What are the layers of the scrotum derived from?

Layers of the abdominal wall


What type of muscle is the cremasteric muscle and what is its role?

Skeletal muscle
Deep to dermis
Runs in spermatic cord
Contracts to raise the testis in cold weather


What type of muscle is the dartos muscle and what is its role?

Smooth muscle in the dermis
Contraction causes wrinkling of the scrotal skin


What is the tunica vaginalis and what can arise from excess fluid present in it?

Is a closed sac of peritoneum which covers the testes
Consists of parietal and visceral layers
Contains thin film of peritoneal fluid

Excess fluid causes hydrocoele


Outline the flow of sperm, starting from the seminiferous tubules

Seminiferous tubules
Straight tubules
Rete testis (form networks)
Efferent ductules
Ductus deferens
Ejaculatory duct
Prostatic urethra
Membranous urethra
Spongy urethra


What type of epithelium lines the epididymis and how does this relate to its function?

pseudostratified columnar epithelium with stereocilia (like long microvilli)

Stereocilia increase the area for absorption from fluid
Can monitor and adjust the fluid composition


For the testes, name the:
a) blood supply
b) venous drainage
c) lymphatic drainage

a) testicular artery
b) paminiform plexus -> testicular vein -> IVC on right side, left renal vein on left side
c) Para-aortic nodes


Name the lymphatic drainage of the scrotum

Inguinal nodes


What muscle composes the ductus deferens and what type of contraction does it do?

Smooth muscle, peristalsis on emission


How long is the ductus deferens?

45cm long


Outline where the ductus deferens runs

Runs in spermatic cord, through inguinal canal
Lies on side wall of pelvis
Turns medially to meet base of bladder (also attaches to seminal vesicles at end/ampulla region)


Anatomically, what are the seminal vesicles?

Outpouchings of the ductus deferens


What are the secretions of the seminal vesicles and their roles?

Alkaline viscous fluid - neutralise the acidic environment in the female tract

Fructose - Used for spermatic ATP production

Prostaglandins - aid sperm mobility and liability, may also stimulate muscle contraction in the female reproductive tract


For the prostate gland, describe its:
a) shape & position
b) secretions & their role

a) Pyramidal in shape, shape and size like a chestnut
Surrounds the beginning of the urethra and secretes fluid into it via many prostatic ducts

b) Slightly acidic fluid containing citrate - used for sperm ATP production
Acid phosphatase & proteolytic enzymes - liquefies coagulated semen


For the bulbourethral glands, describe:
a) size
b) secretion
c) where it opens

a) pea-sized
b) mucus-like secretion (pre-ejaculate)
c) opens into spongy urethra


What does the spermatic cord consist of?

Genitofemoral nerve (from lumbar plexus)
Deferential artery & testicular artery
Ductus deferens
Paminiform plexus (of testicular vein)