Dislocated type-A spermatogonia in human seminiferous tubules.

摘要: Type-A spermatogonia can be found in different locations throughout the germinal epithelium of human seminiferous tubules. Generally they represent population germ cells adjacent to basal lamina, but under special conditions may located adluminal compartment. This aberrant location is not only terminal segments also tubules men older than 65 years age, and cases intratubular seminoma. Furthermore, both cases, type-A occupy an intermediate position between intraluminal locations, without showing any signs cytological damage.