The morphometric investigation of the testis of several breeds is essential to assess and estimate the qualitative variations in testicular machinery and
spermatogenic functions (Raji and Njidda, 2014).
Men with azoospermia due to
spermatogenic failure can only have children with the help of surgical methods and assisted re-productive techniques.
"These potential associations could provide important insight into the decline of total sperm count in Western men, which has been, apart from genetic and direct
spermatogenic damage, largely unexplained," said authors of the study published in the Journal of Human Reproduction.
In testicular azoospermia,
spermatogenic failure occurs while pituitary and hypothalamus work normally.
In adult male rats, decrease in weight of testes, degeneration and necrosis of
spermatogenic and interstitial cells of leydig and absence of spermatogenesis at high doses are all manifestations of toxic effect of lead5.
They analyzed four different groups of
spermatogenic failure subjects, vasectomised, very severe oligoasthenozoospermia (OAT) and normozoospermic subjects (Control).
However,
Spermatogenic activity was present throughout the year in the current study.
A seminoma is a neoplasm derived from benign or malignant transformation of the
spermatogenic germinal epithelium.
Some MNGCs were observed among the
spermatogenic cells, especially among primary spermatocytes, whereas other MNGCs were observed near the seminiferous lumen, which showed signs of exfoliation.
The only reproductive study conducted so far on this subspecies evaluated sperm quality and
spermatogenic activity during the velvet and hard antler periods using testicular biopsy techniques [4].
Kreuzer, "Effect of maca supplementation on bovine sperm quantity and quality followed over two
spermatogenic cycles," Theriogenology, vol.
As described above, communicated to the niche factors, SSCs are strictly regulated to keep their multipotency and to continuously generate different stages of
spermatogenic cells (Figure 1(a)).