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Human testicle with epididymis
-
Human testicle with epididymis
(hematoxylin and eosin)
Testicle
is represented on the slide by a fragment in the mediastinal region:
tunica albuginea
is formed by dense fibrous connective tissue and
mesothelium
of the visceral sheet of the peritoneum;
testicular parenchyma is represented by transverse or oblique sections of
convoluted seminiferous tubules #1
,
#2
,
#3
;
because of the high sensitivity of the epithelial-spermatogenic layer cells to hypoxia, as 12–24 hours passed since the moment of autopsy, the structure of the wall of the convoluted tubules is broken here and does not correspond to the lifetime (postmortem autolysis);
interstitium — layers of
loose connective tissue
in the space between the tubules containing
small blood vessels
and
interstitial endocrinocytes (Leydig cells) #1
.
#2
Straight tubules
— short tubules connecting the convoluted seminiferous tubules to the
rete testis
, are lined with simple cuboidal epithelium.
rete testis
— a system of flattened anastomosing tubules in the connective tissue of the testicular mediastinum, lined with
single-layered cuboidal epithelium #1
,
#2
.
Epididymis
is represented by convoluted
efferent ductules
and
epididymal duct
:
lining of the
efferent ductules
is formed by
high prismatic ciliated #1
,
#2
and
cuboidal/prismatic #1
,
#2
epithelial cells (arranged in groups and alternate with each other, giving the lumen of the tubule a scalloped appearance); due to the processes of postmortem autolysis, the epithelial lining of most of the ductules is separated from the basement membrane;
duct of the epididymis
has a shape of a convoluted tubule lined with
double-lined epithelium
, containing
prismatic cells
with
long microvilli (stereocilia)
on the surface and
basal cells #1
,
#2
(prismatic and basal cells are evenly spaced, so the contour of the lumen is even);
muscular coat
of the efferent ductules and the epididymal duct is formed by
smooth muscle cells #1
,
#2
,
#3
their contraction ensures the transport of sperm along the vas deferens;
adventitia
of the efferent ductules and the epididymal duct is formed by loose connective tissue containing numerous
blood vessels #1
,
#2
and nerve fibers.