Handout #2 of 2 Be sure to also print out Handout #1

1. Handout #2 of 2Be sure to also print out Handout #1 Male Sexual Anatomy, Physiology, & Response

2. Penis • The organ through which both sperm and urine pass. • The shaft of the penis contains two corpora cavernosa and a corpus spongiosum, which fill with blood during arousal, causing an erection. • The head is called the glans penis.

3. Male Circumcision The removal of some or all of the foreskin (prepuce) from the penis 80% of US boys; 15% boys around the world “ no absolute medical indication”, “has potential medial benefits and advantages as well as disadvantages and risks” -American Academy on Pediatrics Recent development - Circumcision and HIV risk

4. Testicles • The paired testes or testicles have two major functions: • Sperm production • Hormone production

5. Seminiferous Tubules • Found within each testicle • Site of spermatogenesis • production of sperm • Two tiny glands called Cowper’s Glands secrete a thick, clear mucus shortly before ejaculation

6. Epididymis • A crescent-shaped structure consisting of a long coiled tube. This is where the sperm mature.

7. Vas Deferens • An 18 inch long tube that joins the ejaculatory duct with the prostate gland. • 1st path taken by sperm during ejaculation.

8. Ureter Urinary Bladder Ampulla Seminal Vesicle Prostate Gland Ejaculatory Duct Bulbourethral (Cowper’s) Gland Spermatid Cord Vas Deferens Epididymis Testis Penis Urethra Glans Penis

9. Seminiferous Tubules • Epididymis • Vas Deferens – • 1st path taken by sperm during ejaculation • Seminal Vesicles • Contributes fluid • Prostate Gland • Contributes fluid • Ejaculatory Duct • Cowper’s Gland • Contributes fluid • Urethra

11. Semen • Semen is the ejaculated liquid that contains sperm. The function of the semen is to nourish sperm and provide them with a hospitable environment and means of transport when they are deposited within the vagina. • It is mainly made up of secretions from the prostate gland. • The semen from a single ejaculation generally contains between 100 million and 600 million sperm.

12. Male Sexual Physiology • The reproductive processes of the male body include the production of hormones and the production and delivery of sperm. • Although men do not have a monthly reproductive cycle comparable to that of women, they do experience regular fluctuations of hormone levels.

13. Hormones • Testosterone • The most important male hormone which triggers sperm production and regulates the sex drive. • FSH • Maintains sperm production • Acts on male cells: Sertoli Cells • LH • Stimulates production of testosterone • Acts on male cells: Leydig cells)

14. Sperm

15. Capacitation • When sperm finally penetrate the cervical mucus • One time explosion of energy that signals a cascade of events, including boosting the motion of the sperm and triggering the actions of the acrosome.

16. 2. Some (~400) enter uterus through cervix 3. Approx. 40 enter fallopiantube 4. Move up fallopian tube, undergo capacitation, and contact egg 1. Hundreds of millions of sperm deposited in vagina The Path of the Sperm

17. Prep for In-Class Assignment Separate sheet of paper Write your Name, Date and In-class Assignment # Write legibly Use blue or black ink Questions will be asked in class Must turn in your assignment to the instructor