1. Epididymides Tightly coiled tubes Connected to ducts within the testis
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Tightly coiled tubes
Connected to ducts within the testis
Promote maturation of sperm cells
Epithelial
cells
Nonmotile
cilia
Sperm cells
© Image Source

2. © The McGraw-Hill Companies, Inc./Al Telser, photographer
Ductus Deferentia
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Are muscular tubes
About 45 centimeters each
Extends from the epididymis to the ejaculatory duct
Lumen
Epithelium
Smooth
muscle
(a)
Sperm in lumen of
ductus deferens
Pseudostratified colum-
nar epithelium
Smooth muscle
(b)
© The McGraw-Hill Companies, Inc./Al Telser, photographer

3. Seminal Vesicles
Attached to the vas deferens near base of the urinary bladder
Secrete alkaline fluid
Secrete fructose and prostaglandins
Contents empty into the ejaculatory duct
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Ureter
Urinary bladder
Ampulla
Seminal vesicle
Ejaculatory duct
Bulbourethral
gland
Prostate gland
Bulb of
penis
Root of
penis
Ductus (vas) deferens
Crus of
penis
Epididymis
Testis
Penis
Urethra
Body of
penis
Glans penis
(b)

4. Manfred Kage/Peter Arnold
Prostate Gland
Surrounds the proximal portion of the urethra
The ducts of the gland open into the urethra
Secretes a thin, milky, alkaline fluid
Secretion enhances fluid mobility
Composed of tubular glands in connective tissue
Also contains smooth muscle
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Secretory cells of the
prostate gland
Smooth muscle
Lumen of urethra
Manfred Kage/Peter Arnold

5. Bulbourethral Glands Inferior to the prostate gland
Secrete mucus-like fluid
Fluid released in response to sexual stimulation
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Ureter
Urinary bladder
Ampulla
Seminal vesicle
Ejaculatory duct
Bulbourethral
gland
Prostate gland
Bulb of
penis
Root of
penis
Ductus (vas) deferens
Crus of
penis
Epididymis
Testis
Penis
Urethra
Body of
penis
Glans penis
(b)

6. Bulbourethral Glands Inferior to the prostate gland
Secrete mucus-like fluid
Fluid released in response to sexual stimulation
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Ureter
Urinary bladder
Ampulla
Seminal vesicle
Ejaculatory duct
Bulbourethral
gland
Prostate gland
Bulb of
penis
Root of
penis
Ductus (vas) deferens
Crus of
penis
Epididymis
Testis
Penis
Urethra
Body of
penis
Glans penis
(b)

7. Semen
The fluid the urethra conveys to the outside during ejaculation is called semen
Semen consists of:
Sperm cells
Secretions of the seminal vesicles, prostate gland, and bulbourethral glands
It is slightly alkaline
Contains prostaglandins
Contains nutrients
Volume is 2-5 milliliters of semen per ejaculation
Average 120 million sperm cells per milliliter of semen

8. Scrotum Pouch of skin and subcutaneous tissue
Dartos muscle – smooth muscle in subcutaneous tissue; contracts to cause wrinkling of the scrotum
Medial septum divides the scrotum into two chambers
Each chamber is lined with a serous membrane
Each chamber houses a testis and epididymis

9. Penis Conveys urine and semen
Specialized to become erect for insertion into the vagina
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Superficial dorsal vein
Deep dorsal vein
Dorsal nerve
Dorsal artery
Deep artery
Corpora cavernosa
Tunica albuginea
Skin
Urethra
Subcutaneous
tissue
Corpus spongiosum
Connective tissue
(fascia)
Prepuce
External urethral orifice
Glans penis
(a)
(b)

10. Erection, Orgasm, and Ejaculation
The erection:
Parasympathetic nerve impulses
Blood accumulates in the erectile tissues
The orgasm:
Culmination of sexual stimulation
Accompanied by emission and ejaculation
The ejaculation:
Emission is the movement of semen into the urethra
Ejaculation is the movement of semen out of the urethra
This is largely dependent on sympathetic nerve impulses

11. Male Sex Hormones The male sex hormones are called androgens
Interstitial cells in the testes produce most of them, but small amounts are made in the adrenal cortex
Testosterone is the most important

12. Actions of Testosterone
Increased growth of body hair
Sometimes decreased growth of scalp hair
Enlargement of the larynx and thickening of the vocal cords
Thickening of the skin
Increased muscular growth
Thickening and strengthening of the skeletal bones