Скачать или смотреть Testis || Human Reproductive system (part 02)

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#seminiferoustubules Located outside the abdominal cavity (extraabdominal) with in a pouch called scrotum;
scrotum provides a temperature 2.0 – 2.5°C
lower than the body temperature necessary for
spermatogenesis.
Each testis is oval in shape and measure about 4
to 5 cm in length, 2–3 cm in width and about 3
cm in thickness.
The testis is covered by a dense covering called
tunica albuginea.
Internally the testis is divided into about 250
compartments, called testicular lobules.
Each lobule contains 1–3 highly coiled seminiferous
tubules (the structural and functional units of
testis) in which sperms are produced.
The seminiferous tubule has a tunic of connective
tissue and is internally lined by seminiferous or
germinal epithelium.
The seminiferous epithelium consists of two types
of cells: (1) Sertoli cells and (2) spermatogonia,
that form the male germ cells or spermatozoa.
Sertoli cell provide nutrition and shape to the
developing germ cells and spermatozoa.
The spermatogonia undergo cell divisions to form
spermatozoa.
The spaces called interstitial spaces, between
the seminiferous tubules have connective
tissue, which includes blood vessels and Leydig
cells (also called Interstitial cells); Leydig cells
synthesise and secrete the male sex hormones
called androgens of which testosterone is the
principal one.