So these tubules, shown in brown are the Simonerfrost tubules and if we examine the microscopic section of the simoniferous tubules, we basically get the following diagram. So within our Simoner PHOs tubules we have two very important types of cells that are involved in sperm production as well as in the production of our androgens the male sex hormones. So we have sirtoli cells which are these large cells shown that contain the blue nuclei as shown. And connecting these surtoli cells are the intercellular junctions, the tide junctions which basically create a watertight seal. Now, below our surtole cells, what keeps our surtoli cells together and attached to a membrane is this basement membrane layer. And below that we have these fibroblasts which are specialized types of cells that produce and release collagen that forms the extracellular matrix that surrounds our cells.