Chapter 27
The Reproductive System
1021
27
Lying in the sof connective tissue surrounding the sem-
iniFerous tubules are the
interstitial endocrine cells
, also
called
Leydig cells
(±igure 27.3c). Tese cells produce andro-
gens (most importantly
testosterone
), which they secrete into
Head of epididymis
Body of epididymis
Tail of epididymis
Efferent ductule
Rete testis
Straight tubule
Duct of epididymis
Ductus (vas)
deferens
Lobule
Testis
Epididymis
Septum
Tunica albuginea
Tunica vaginalis
Cavity of
tunica vaginalis
Spermatic cord
Seminiferous
tubule
Blood vessels
and nerves
(a)
Spermatogenic
cells in tubule
epithelium
Sustentocyte
Interstitial
endocrine
cells
Areolar
connective
tissue
Sperm
Myoid cells
(c)
Seminiferous
tubule
(b)
Ductus deferens
Figure 27.3
Structure of the testis. (a)
Partial sagittal section through the testis and
epididymis. The anterior aspect is to the right. (For a related image, see
A Brief Atlas of the Human
Body
, Figure 73).
(b)
External view of a testis from a cadaver; same orientation as in (a).
(c)
Seminiferous tubule in cross section (270
3
). Note the spermatogenic (sperm-forming) cells in the
tubule epithelium and the interstitial endocrine cells in the connective tissue between the tubules.
enter the
epididymis
(ep
0
ĭ-did
9
ĭ-mis), which hugs the external
testis surFace posteriorly. Te immature sperm pass through the
head, the body, and then move into the tail oF the epididymis,
where they are stored until ejaculation.
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