Review Note

If you go along the seminiferous tubule, every slice is at a slightly different stage of the cycle of the seminiferous epithelium. ALL CYLCING INDEPENDENTLY. Always multiple points where there is sperm being released into the lumen.

 

8 different stages - think of the bottom BM and lumen at the top

 

Down the bottom we have very immature spermatagonia.

Up the top we have the spermatids.

8 different stages of the cycles seminiferous epithelium.

       

      labelled 1-8 laterally along the page. If we were at a seminiferous tubule going along here, that at each slice you are going through 1-8 in that one plane. Takes in the bull 13.5 days in the bull to go 1-8 to get the elongated spermatids at the top to be released. Once they get to 8 they go back to 1 again. When they go from 8 back to 1 they release sperm into the lumen.

Constant supply of sperm because they are all sitting at different stages.