839
CHAPTER TWENTY-TWO
Reproductive System
Ductus Deferentia
The
ductus deferentia
(duk
tus def
er-en
sha; sing.,
duc-
tus deferens
), also called
vasa deferentia,
are muscular
tubes about 45 centimeters long lined with pseudostrati-
fied columnar epithelium
(fig. 22.13)
. Each ductus def-
erens originates at the lower end of the epididymis and
passes upward along the medial side of a testis to become
Mitochondria
Golgi apparatus
Excess
cytoplasm
Mitochondria
Midpiece
Tail
Head
Acrosome
Centriole
Nucleus
Flagellum
Excess cytoplasm
and most organelles lost
(a)
FIGURE 22.10
Spermiogenesis—sperm cell maturation. (
a
) The
head of the sperm develops largely from the nucleus of the formative
cell. (
b
) Parts of a mature sperm cell.
FIGURE 22.11
Falsely colored scanning electron micrograph of
human sperm cells (1,400×).
Midpiece
(with mitochondria)
Tail
Acrosome
Head
Nucleus
(b)
Epithelial
cells
Nonmotile
cilia
Sperm cells
FIGURE 22.12
Cross section of a human epididymis (200×).
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