Reproduction 1 - Male Reproductive System Flashcards
What are the 4 categories the male reproductive system can be grouped into?
- The External Genitalia
- The Gonads – Where gametes or sex cells are produced and also the site for the production of male sex hormones
- The Tube System – For transporting the sperm from the gonads
- The Accessory Glands – These support the sperm and lubricate the copulatory organs.
What are some of the organs of the male reproductive system?
- Testis
- Vas Deferens or Ductus Deferens
- Seminal glands
- Prostate
- Epididymis
- Bulbourethral glands
What is A?
Urinary bladder
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What is B?
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Ureter
What is C?
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Vas deferens
What is D?
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Seminal glands
What is E?
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Prostate
What is F?
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Bulbourethral glands
What is G?
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Urethra
What is the name of the canal that the testis pass through during development?
Inguinal canal
What are the deep and superficial openings of this canal called?
Superficial and deep inguinal rings
What is A?
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External spermatic fascia
What is B?
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Cremaster muscle and fascia
What is C?
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Internal spermatic fascia
What is D?
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Superficial inguinal ring
What are the 3 fascial layers of the inguinal canal from superficial to deep?
External spermatic fascia
Cremaster muscle and fascia
Internal spermatic fascia
What doing the inguinal canal carry?
This canal carries a group of structures known as the spermatic cord.
What are the 6 main structures of the spermatic cord?
1) Vas deferens
2) Testicular artery
3) Artery of the ductus deferens
4) Cremasteric artery
5) Pampiniform plexus
6) Genital branch of genitofemoral nerve
What are the ovoid testes suspended in the scrotum by?
Spermatic cord
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What is the tough outer fibrous layer of the testis called?
Tunica albuginea
What are the 2 layers of the tunica vaginalis?
Visceral and parietal
What material is present between the 2 layers of the tunica vaginalis?
Small amount of lubricating fluid
What are 2 pathologies associated with the tunica vaginalis?
- Hydrocele
- Haematoceles
What is hydrocele?
Swelling in the scrotum that occurs when fluid collects in the thin sheath surrounding a testicle
What causes hydrocele?
Injury or inflammation within the scrotum
What is haematocele?
Swelling caused by blood collecting in a body cavity
What causes haematocele?
Trauma to the testicles
The testis are supplied by what?
Testicular artery
What is the testicular artery a branch of?
Abdominal aorta
At what vertebral level does the testicular artery arise?
L2-L3
How does the testicular artery travel between the abdominal aorta and the inguinal canal?
These arteries travel retroperitoneally and cross two important structures near the pelvic brim before they travel through the inguinal canal.
- Ureters 2. Common iliac artery
What 2 structures does the testicular artery cross before entering the inguinal canal?
1) Ureters
2) Common iliac artery
What is the term used for the 8-12 anastomosing veins associated with the testis?
Pampiniform plexus
What is the function of the pampiniform plexus?
Thermoregulation to allow sperm maturation
Into which veins does the right and left testicular vein drain into?
The right testicular vein drains into IVC
The left testicular vein drains into left renal vein
What is a varicocele?
Enlargement of the veins within scrotum
What is the main cause of varicocele?
Defective valves
What 2 lymph node groups receive lymph from the testis?
Para-aortic and Lumbar
What is the lymphatic drainage of the following:
- prostate
- seminal vesicle
- scrotum
- penis
- Prostate
- Internal iliac and sacral nodes
- Seminal vesicle
- Internal and external lymph nodes
- Scrotum
- Inguinal lymph nodes
- Penis
- Penile skin accompanies the external pudneal vessels to the superficial inguinal nodes
- Glans goes to the deep inguinal and external iliac nodes
- Erectile tissue and penile urethra goes to the internal iliac lymph nodes
What is the function of the epididymis?
The epididymis is attached to the body of the testis, and stores sperm that is produced by the testis.
What is the vas deferens and what does it connect?
This is a muscular tube which arises from the tail of the epididymis, traverses the inguinal canal and enters the pelvis by crossing over the external iliac vessels. It terminates by joining the duct of the seminal gland to form the ejaculatory duct.
What vessel does the vas deferns cross after entering the pelvis?
External iliac vessels
What does the vas deferens form when it joins the duct of the seminal gland?
Ejaculatory duct
What are the seminal glands also called?
Seminal vesicles
Where are the seminal glands located?
These paired structures are located on either side of the posterior surface of the bladder, note their relation to the ureter, the vas deferens and the prostate gland.
What secretions are prodcued by the seminal vesicles?
Constitutes bulk of the seminal fluid, thick fluid contains fructose, proteins, citric acid, inorganic phosphorus, potassium and prostaglandins
What is the prostate gland infused to and what does it surround?
The prostate gland is fused to the inferior part (neck) of the bladder and surrounds the prostatic urethra
What secretions are produced by the prostate?
Proteolytic enzymes, prostatic acid, phosphatase, fibrinolysis, zinc and prostate-specific antigen
What is A?
Vas deferens
What is B?
Ureter
What is C?
Seminal vesicle
What is D?
Prostate
Why might an enlarged prostate gland cause retention of urine?
Due to obstruction of urethra
What is the clinical significance of drainage from the prostatic venous plexus? (Think of how cancer spreads)
The prostatic venous plexus drains into the internal iliac vein which connects with the vertebral venous plexus, this is thought to be the route of bone metastasis of prostate cancer.
What are bulbourethral glands also called?
Cowper’s glands
Where are bulbourethral glands located?
These are small, paired structures located in the urogenital diaphragm which empty into the penile/spongy urethra.
Where do bulbourethral glands release into?
penile/spongy urethra.
What secretions are produced by bulbourethral glands?
Alkaline mucus like fluid (Cowper’s fluid)
Describe the histological features of the testis (seminiferous tubules)?
Convoluted tubules sectioned in various planes
4-8 layers of cells
Spermatozoa in the lumen
Leydig cells in the interstitial spaces between tubules
Describe the histological features of the prostate?
Serous alveoli with infolding epithelium
Trabeculae of muscular stroma
Amorphous eosinophilic masses, called corpora amylacea, in the alveoli in older men
Describe the histological features of the seminal vesicle?
No sperms in the lumen
Highly recessed and irregular lumen forming crypts and cavities giving a honey-combed appearance
Well-developed muscular externa
Describe the histological features of the ductus deferens?
Lumen Stellate in shape
A thick-walled muscular tube
Epithelial lining and its supporting lamina propria are thrown into longitudinal folds
What is this image?
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ductus deferens
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Seminal vesicle
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epididymis
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testes
What is this image?
prostate
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