1. Male Anatomy

2. Male anatomy - sagittal view
1. Testis: Produce and store millions of sperm cells. Makes testosterone
2. Epididymis: Coiled tubes that hold sperm for 2-3 months until they mature. 5 4
3. Vas deferens: Tube that passes mature sperm from epididymis to penis. 3
4. Prostate gland: Provides 30-35% of the seminal fluid. 2
5. Seminal vesicles: Sac-like structures attached to the vas deferens that produce 60% of seminal fluid. 1

3. Cowper’s gland (also called the bulbourethral gland) produces the fluid that is released from the penis before ejaculation. This fluid “flushes out” the urethra before the arrival of semen.

4. 6. Scrotum: Pouch-like structure outside the body that maintain the testicles at a certain temperature.
7. Bladder: Organ that collects/stores urine. 7
8. Urethra: Channel that carries semen and urine out of the body 10 8
9. Penis: Made up of spongy tissue that can expand and contract. 9
10. Anus: Opening from which feces leaves the body. 6

5. Semen Production & Ejaculation
4. Seminal vesicle and prostate gland add fluid to make semen
3. Sperm leave through vas deferens
5. Semen leaves through urethra
2. Sperm mature in epididymis
1. Sperm are made in the testicles

6. Sperm production
Beginning at puberty, the pituitary gland stimulates the testicles to start producing testosterone, the male sex hormone

7. Testosterone initiates sperm production
Sperm production starts in seminiferous tubules, organized into lobules

8. Cross section of seminiferous tubules

9. Leydig cells produce testosterone

10. Germ cells are any cells that give rise to gametes (sex cells)
Male germ cells are called spermatogonia (spermatogonium is singular)
Every day, about 25 million spermatogonia begin the process to become mature sperm

11. Spermatogonia enter meiosis (begin to mature and divide) to become primary spermatocytes
Primary spermatocytes split into two cells called secondary spermatocytes
Now the two secondary spermatocytes each split to become four spermatids cells

12. Spermatogonia
If 25 millions spermtogonia begin the meiosis process every day… that means 100 million sperm are made every day!
primary spermatocytes
2 secondary spermatocytes
4 spermatids

13. Anatomy of sperm
The nucleus contains all the genetic information from the male body
The acrosome covers the nucleus. The job of the acrosome is to penetrate the protective layer of the ovum
The flagellum whips back and forth to move the sperm towards the ovum

14. Once mobile, the sperm travel from the seminiferous tubules into the rete testis

15. From the rete testis, the sperm enter the epididymis where they are stored until they finish maturing and are ejaculated

16. Cross section of the penis
The corpora cavernosa and corpus spongiosum are erectile tissue. Inside these chambers have a lot of blood vessels. When a person is aroused the vessels fill with blood and expand  causing an erection.

17. Base or root of penis
Shaft of penis
Head or glans of penis

18. Circumcision
Whether a person is circumcised depends on their family, culture,
religion, and personal preferences.