So to review what we just discussed, let's take a look at the following flow chart. So let's begin with our hypothalamus. So the hypothalamus produces a hormone known as GnRH, the gonadotropin releasing hormone which then travels to the anterior pituitary gland through the hypothesial portal system. And once it attaches to the endocrine cells in the interior pituitary gland, it causes those endocrine cells to release the follicle stimulating hormone and the lutenizing hormone. Now, the lee nizing hormone travels through our bloodstream and eventually attaches onto our lathic cells and it stimulates those Levic cells to release testosterone. At the same time the follicle stimulating hormone attaches onto our surtovi cells and it causes these cells to basically provide the nutrients to our developing sperm cells.