The Reproductive System: Male Anatomy
 ____________ — primary sex organs
 Testes in males
 Ovaries in females
 Gonads produce gametes (sex cells) and secrete
____________
 Sperm—male gametes
 Ova (eggs)—female gametes
Male Reproductive System Overview
 Testes
 Duct system
 ____________
 Ductus (vas) deferens
 Urethra
 Accessory organs
 Seminal vesicles
 ____________
 Bulbourethral glands
 External genitalia
 Penis
 ____________
16.1.2 When provided with a model or diagram,
identify the organs of the male reproductive
system and discuss the general function of each.
Testes
 Olive-sized
 Coverings of the testes
 ____________ ____________ —capsule that surrounds each testis, fibrous connective tissue
 Septa—extensions of the capsule that extend into the testis and divide it into lobules
 Each lobule contains ____________ ____________ seminiferous tubules
 Tightly coiled structures
 Function as ____________ -forming factories
 Empty sperm into the rete testis (first part of the duct system)
 Sperm travels through the ____________ to the epididymis
 Interstitial cells in the seminiferous tubules produce androgens such as ____________
16.1.5 - Trace the pathway followed by a sperm from the testis to the body exterior.
Duct System
16.1.6 - Define erection, ejaculation, and circumcision.
 Epididymis
 Ductus (vas) deferens
 Urethra
 Epididymis
 _____________ -shaped, tightly coiled tube
 Found on the superior part of the testis and along the posterior lateral side
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 Functions to _____________ and ___________ sperm cells (at least 20 days)
 Expels sperm with the contraction of muscles in the epididymis walls to the _____________
 About______ long
 Ductus Deferens (Vas Deferens)
 Carries sperm from the epididymis to the _____________ duct
 Passes through the inguinal canal and over the bladder
 Moves sperm by _____________ (wave like motion of smooth muscles)
 _____________ cord—ductus deferens, blood vessels, and nerves in a connective tissue sheath
 Ends in the ejaculatory duct which unites with the urethra
 Expanded end is called the _____________
 Ejaculation — _____________ muscle in the walls of the ductus deferens create peristaltic waves to
squeeze sperm forward
 Vasectomy
 cutting of the ductus deferens at the level of the testes to prevent _____________ of sperm
 Sperm is still produced, but they eventually deteriorate and are _________________ .
 Urethra
 Extends from the base of the _____________ bladder to the tip of the penis
 Carries both urine and sperm
 ___________ enters from the ejaculatory duct
 Regions of the urethra
 Prostatic urethra—surrounded by prostate
 _____________ urethra—from prostatic urethra to penis
 Spongy (penile) urethra—runs the length of the _____________
Accessory Organs
 Seminal vesicles
 _____________
 Bulbourethral glands
 Seminal Vesicles
 Located at the _____________ of the bladder
 Produces a thick, yellowish secretion (_____% of
semen)
 _____________ (sugar)
 Vitamin C
 Prostaglandins
 Other substances that _____________ and
activate sperm
 Prostate
 Size and shape of a chestnut
 Encircles the upper part of the _____________
 Secretes a _____________ fluid
 Helps to activate sperm
 Enters the urethra through several _________
 Reputation as a health destroyer
 Hyertrophy (________________) – affects nearly every elderly male.
 Difficulty urinating, bladder infections, kidney damage, cancer
 Bulbourethral Glands
 Pea-sized gland inferior to the prostate
 Produces a thick, clear _____________
 Cleanses the urethra of _____________
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
Serves as a lubricant during sexual intercourse
16.1.4 Discuss the composition of semen and name the glands that produce it.
 Semen
 Mixture of _____________ and accessory gland secretions
 Advantages of accessory gland secretions
 Fructose provides ____________ for sperm cells
 Alkalinity of semen helps _____________ the acidic environment of vagina
 Semen inhibits bacterial multiplication
 Elements of semen enhance sperm motility
 2-5mL of semen propelled during ejaculation
 Contains _____________ million sperm per mL
 Male infertility
 Commonly caused by a problem with semen.
 Sperm count, motility and morphology, semen volume, pH, fructose content
16.1.6 - Define erection, ejaculation, and circumcision.
External Genitalia
 Scrotum
 Penis
 Scrotum
 Divided sac of skin outside the abdomen
 Maintains testes at 3°C (about ______ºF) lower than normal body temperature to protect sperm viability
 When it is cold out side the skin will become highly _____________ and pull the testes closer to the
body to be able to maintain temperature.
 Penis
 Delivers _____________ into the female reproductive tract
 Regions of the penis
 Shaft
 _________ penis (enlarged tip)
 Prepuce (foreskin)
 Folded cuff of skin around proximal end
 Often removed by _____________
 External Genitalia
 Internally there are three areas of _____________ erectile tissue around the urethra
 Erections occur when this erectile tissue fills with _____________ during sexual excitement
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