Chapter 27
The Reproductive System
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27
up most of the penis and are bound by the fibrous tunica al-
buginea. Teir proximal ends form the
crura of the penis
(kroo
9
rah; “legs”; singular: crus). Each crus is surrounded by
an ischiocavernosus muscle and anchors to the pubic arch of
the bony pelvis.
part of the root called the
bulb of the penis
. Te sheetlike bul-
bospongiosus muscle covers the bulb externally and secures it
to the urogenital diaphragm.
Te paired dorsal erectile bodies, called the
corpora cav-
ernosa
(kor
9
por-ah kă-ver-no
9
sah; “cavernous bodies”), make
Urinary bladder
Dorsal vessels
and nerves
Skin
Deep arteries
(b)
(a)
Bulbo-urethral gland and duct
Urogenital diaphragm
Bulb of penis
Corpora cavernosa
Corpus spongiosum
Section of (b)
Spongy urethra
Prepuce (foreskin)
External urethral orifice
Corpora cavernosa
Urethra
Tunica albuginea of
erectile bodies
Corpus spongiosum
Crus of penis
Bulbo-urethral duct opening
Ductus deferens
Ampulla of ductus deferens
Prostatic urethra
Orifices of prostatic ducts
Prostate
Intermediate part
of the urethra
(membranous urethra)
Root of penis
Body (shaft) of penis
Glans penis
Ejaculatory duct
Seminal gland
Epididymis
Testis
Ureter
Figure 27.5
Male reproductive structures. (a)
Posterior view showing longitudinal (frontal)
section of the penis.
(b)
Transverse section of the penis, dorsal aspect at top.
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