360
UNIT 3
Organ Systems
Intratesticular Genital Ducts
Fig. 18-14B
Fig. 18-15A,B
Ductus
epididymis
Mediastinum
Ductus
deferens
Ductus
epididymis
Ductuli
efferente
Rete testis
Tubuli recti
Seminiferous
tubule
Intratesticular
genital
ducts
Fig. 18-14C
Testis
A
Lumens of
Lumens of
seminiferous
seminiferous
tubules
tubules
Lumens of
seminiferous
tubules
Seminiferous
Seminiferous
tubule
tubule
Seminiferous
tubule
Lumens of the
Lumens of the
tubulus rectus
tubulus rectus
Lumens of the
tubulus rectus
B
Tubulus rectus
Tubulus rectus
Tubulus rectus
Rete testis
Rete testis
Rete testis
Mediastinum
Mediastinum
Mediastinum
Lumen of
Lumen of
rete testis
rete testis
Lumen of
rete testis
C
Figure 18-14A.
Intratesticular genital ducts.
H&E,
3
6
The series of ducts which transport spermatozoa from the seminiferous tubules to the outside of the male body are called
genital
ducts
. They include
intratesticular genital ducts
and
extratesticular genital ducts
. The
intratesticular genital ducts
refer to ducts
within the testis. They are composed of the
tubuli
recti
,
rete
testis
, and
ductuli
efferentes
. The
extratesticular genital ducts
include
the
ductus
epididymis
,
ductus
deferens
,
ejaculatory
ducts
, and
urethra
.
Figure 18-14B.
Tubuli recti.
H&E,
3
71; inset
3
210
The
tubuli recti
are short (about 1 mm), straight tubules that
carry the spermatozoa from the seminiferous tubules into the
rete testis.
Rectus
means “straight.” Each tubulus rectus is
lined by a single layer of cuboidal epithelial cells and is sup-
ported by a layer of dense connective tissue. It is located in
the septum (connective tissue) and opens into the rete testis
in the mediastinum. The terminal portion of the seminiferous
tubules is lined by Sertoli cells. The germinal cells in the sem-
iniferous tubules are gradually reduced in number near the
tubuli recti and disappear at the terminal portion. The
sper-
matozoa
are pushed forward by the fl ow of the testicular fl
uid
through the tubuli recti and into the
rete testis
. An example
here shows two segments of a tubulus rectus.
Figure 18-14C.
Rete testis.
H&E,
3
35; inset
3
163
The
rete testis
is an interconnecting network of tubules
located in the mediastinum. These tubules have an irregu-
lar lumen and are lined by simple cuboidal epithelium and
supported by a dense connective tissue. This example shows
the terminal portion of the tubulus rectus opening into the
tubule of the rete testis.
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