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

2. Male Gonads – testes
External Genitalia
Penis
Testes

3. 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.

4. 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

5. Testicles The paired testes or testicles have two major functions:
Sperm production
Hormone production
Point of origin
Back wall of the abdomen
Descent into scrotum (7 months)
Undescended testicles

6. Seminiferous Tubules Found within each testicle
Site of spermatogenesis
production of sperm
about 60 days
Two tiny glands called bulbourethral (Cowper) Glands secrete a thick, clear mucus shortly before ejaculation

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

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

9. Prostate Gland Seminiferous Tubules Epididymis Ductus (vas) Deferens –
1st path taken by sperm during ejaculation
Seminal Vesicles
Contributes fluid (most of the seminal fluid)
Prostate Gland
Contributes fluid (15 – 30%)
Ejaculatory Duct
Cowper’s Gland
Contributes fluid
Urethra

10. Sperm Acrosome: Head: Middle piece: Tail:
Contains enzymes that help penetrate the egg.
Head:
Contains nucleus/genetic material
Middle piece:
Energy
Tail:
Movements

11. Semen Ejaculated liquid that contains sperm.
Function is to nourish sperm and provide them with a hospitable environment and means of transport when they are deposited within the vagina.
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 FSH LH
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. Capacitation Maturation of sperm in the female tract.
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.

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

16. 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
In-class assignments are open book and worth 10 points. Only given in-class.