Continue forward and converge caudal to the body of the penis. After they join on the underside of the penis they continue forward to the glans penis The retractor penis muscles pull the flaccid penis back into the prepuce. Blood and Nerve Supply Blood to the testis is supplied by the testicular arteries. Testicular veins parallel the testicular arteries. Both artery and vein are enclosed within the spermatic cord.
Blood entering the testis is cooled by the venous blood leaving the testis.
In addition to autonomic nerve fibers to the testis, penis and Accessory glands, the penis is supplied by a spinal nerve, the pudendal nerve. Sensory stimulation of the glans provides the afferent side For reflexes associated with erection and ejaculation. Reflex centers for erection and ejaculation are in the Lumbar region of the spinal cord. Motile to a potentially motile cell with a flagellum. During the final phase of spermiogenesis the spermatids are Released into the lumen of the seminiferous tubules as spermatozoa.