CHAPTER 18
Male Reproductive System
347
Seminal
vesicle
Prostate
gland
Bulbourethral
gland
Bladder
Sacral
vertebra
Rectum
Ejaculatory
duct
Ductus
deferens
Corpus
cavernosum
Penile
urethra
Urethra
Urethral
orifice
Glans
penis
Penis
Epididymis
Testis
Scrotum
Figure 18-1.
Overview of the male reproductive system.
The
male reproductive system
includes the
testes
,
genital ducts
,
accessory genital glands
, and
penis
. There are two
testes
where sper-
matogenesis takes place and sex hormones (testosterone) are produced. The
genital ducts
include
intratesticular genital ducts
and
extratesticular genital ducts
. The
intratesticular genital ducts
comprise the
tubuli recti, rete testis
, and
ductuli efferentes
, which are
located inside of the testis. The
extratesticular genital ducts
comprise the
ductus epididymis
,
ductus deferens
,
ejaculatory duct
, and
urethra
. The
accessory genital glands
include three major glands: the
seminal vesicles
,
prostate gland
, and
bulbourethral glands
. Two
ejaculatory ducts meet with the
prostatic urethra
before it continues its course through the urogenital diaphragm as the
membranous
urethra
and then through the penis as the
penile urethra
. The
penis
is composed of three cylinders of spongy erectile tissue including
the two corpora cavernosa and the corpus spongiosum (containing the urethra).
Structures of the Male Reproductive System
I.
Testes
A. Testicular tunicate
1. Tunica vaginalis
2. Tunica albuginea
3. Tunica vasculosa
4. Medastinum testis
5. Special cells (interstitial cells of Leydig)
B. Seminiferous tubules
1. Spermatogenic cells
2. Sertoli cells
II. Genital ducts
A. Intratesticular genital ducts
1. Tubuli recti
2. Rete testis
3. Ductuli efferentes
B. Extratesticular genital ducts
1. Ductus epididymis
2. Ductus (vas) deferens with spermatic cord
3. Ejaculatory ducts
4.
Urethra (prostatic, membranous, and spongy/penile
urethra)
III.
Accessory genital glands
A.
Prostate gland
B.
Seminal vesicles
C.
Bulbourethral glands
IV. Penis
A.
Tunica albuginea
B.
Corpus cavernosum
C.
Corpus spongiosum and spongy/penile urethra
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