It depends on a complex interaction of psychological, neural, vascular and endocrine factors. When the body is cold, the scrotum shrinks and becomes tighter to hold in body heat. High fructose concentrations provide nutrient energy for the spermatozoa as they travel through the female reproductive system. Below are some examples of disorders that affect the male reproductive system Disorders of the Scrotum, Testicles, or Epididymis. Disorders of the Scrotum, Testicles, or Epididymis Conditions affecting the scrotal contents may involve the testicles, epididymis, or the scrotum itself. During ejaculation, semen passes through the ducts and exits the body via the penis.
The penis, which usually hangs limp, becomes hard when a male is sexually excited.
Pathway of sperm
The whip-like tail flagellum of the sperm is studded with ion channels formed by proteins called CatSper. Mainly present in the armpits and around the genital area, their activity is the main cause of sweat odor, due to the bacteria that break down the organic compounds in the sweat. Sperm travels through the ductus deferens and up the spermatic cord into the pelvic cavity, over the ureter to the prostate behind the bladder. The penis is an external genital organ. Sperm release pathway The key male reproductive organs include the testes, epididymis, urethra, vas deferens, prostate gland, seminal vesicle, and penis. Sperm can be detected in the morning urine of most boys after the first year of pubertal changes and occasionally earlier. The right testicular vein drains directly into the inferior vena cava.