The testis is the male gonad located in the scrotum. It has two poles, two borders, and two surfaces. The testis is covered by three layers: the tunica vaginalis, tunica albuginea, and tunica vasculosa. Internally, the testis contains 200-300 lobules with seminiferous tubules that produce sperm. The testis receives blood supply from the abdominal aorta and drains into veins that lead to the inferior vena cava or left renal vein. Lymphatic drainage is to the pre-aortic and para-aortic lymph nodes. The testis has both sensory and motor nerve supply. Abnormalities can