Untitled

+--------------+
                                      |              |
                                      |  Testicular  |
                                      |   lobules    |
                                      |              |
                                      +------+-------+
                                             |
                                             |
                                             v
                                      +------+-------+
                                      |              |
                                      |Seminiferous |
                                      |   tubules    |
                                      |              |
                                      +------+-------+
                                             |
                                             |
                +---------------------+------+-------+---------------------+
                |                     |                  |                 |
                v                     v                  v                 v
        +-------+-------+     +-------+-------+   +-------+-------+  +------+-------+
        |                |     |                |   |                |  |               |
        |Male Germ Cells|     |   Sertoli    |   | Interstitial   |  |   Leydig   |
        |   (Spermatog.) |     |     Cells    |   |    Spaces      |  |    Cells   |
        |                |     |                |   |                |  |             |
        +-------+-------+     +-------+-------+   +-------+-------+  +------+-------+
                |                     |                  |                 |
                |                     |                  |                 |
                v                     v                  v                 v
        +-------+-------+     +-------+-------+   +-------+-------+  +------+-------+
        |                |     |                |   |                |  |               |
        |Meiotic Divisions|     |Nutrition to   |   |Blood Vessels, |  |   Synthesis  |
        |    (Sperm Form.)|     |  Germ Cells   |   |    Immune     |  |   of         |
        |                |     |                |   |   Cells, etc. |  |  Androgens   |
        +-------+-------+     +-------+-------+   +-------+-------+  +------+-------+
                |                     |                  |                 |
                |                     |                  |                 |
                v                     v                  v                 v
         +------+------+     +-------+-------+   +-------+-------+  +------+-------+
         |             |     |                |   |                |  |               |
         |   Rete      |     |   Epididymis   |   |    Vas Deferens|  |   Ejaculatory |
         |   Testis    |     |                |   |                |  |     Duct      |
         |             |     |