Male reproductive anatomy

Question 1

Scrotum:

Answer 1

• medial pouch enclosing testes

- dartos muscle (subcutaneous smooth muscle)

Question 2

Penis:

Answer 2

• male copulatory organ (erectile)
• glans penis
• prepuce
• corpora cavernosa
• corpus spongiosum

Question 3

Gross anatomy of testes

Answer 3

• tunica vaginalis: serous membrane over testes
  
  • epididymis: sperm reservoir upon testes
  • spermatic cord: cable-like structure containing spermatic vein, artery, lymphatics, and nerves
  • vas deferens: tube from epididymis to ejaculatory duct entering prostate gland; passes into pelvic cavity through inguinal canal
  • cremaster muscle: skeletal muscle surrounding cord and testes; reacts to outside temp. changes

Question 4

microanatomy of testes

Answer 4

1. semineferous tubules—> spermatozoa
   
   • activated at puberty by FSH
2. interstitial cells—> testosterone
   
   • activated at puberty by ICSH

Question 5

Accessory reproductive glands

Answer 5

1. seminal vesicles (x2):
   - posterior to bladder
   - produce 60% of seminal fluid
   - secrete into the ejaculatory duct, emptying into prostatic urethra
   - seldom contain sperm
2. prostate gland:
   - surrounds prostatic urethra
   - contributes 30% of seminal fluid
3. bulbourethral glands (cowper’s):
   - located inferior to prostate within urogenital diaphragm
   - discharge just prior to ejaculation
   - contribute an alkaline fluid to neutralize the penile urethra.

Question 6

pathway for sperm transport

Answer 6

semineferous tubules—> epididymis—> vas deferens—> through ejaculatory duct—> prostatic urethra —> membranous urethra—> penile urethra—> female vagina