4Sac-like structure that houses the testes. ScrotumSac-like structure that houses the testes.The function of scrotum is to keep the testes 1-2°C cooler than the body temperature which is 37°C.
5TestesThe two testes are oval structures about 5 cm long and 3 cm in diameterHeld in the scrotumThey produce sperm in the tubes called Seminiferous Tubules.Also produce sex hormone called testosterone.the tunica albuginea, surrounds each testis and extends inward to form septa that partition the organ into lobules There are about 250 lobules in each t%stis& Each contains 1 to 4 highly coiled seminiferous tubules that converge to fo"m a sin'le straight tubule, which lea$s into the rete tEstis. Short eFferent ducts exit the 4estes.Interstitial cells (cells of eydig), which prkduce male sex Hormones, are located between the saminifernus tubules within a lobule
7Epididymis A long tube (about 6 meters) located on top of the testes. Sperm is made in the testes in tubes called seminiferous tubules.Sperm that leave the testes are immature.Sperm complete their maturation process as they move through the epididymis.Mature sperm are stored in the lower portion of the epididymis.
8Vas DeferensThe two vas deferens are flexible tubes that start at the epididymis and joins the urethra at the base of prostate gland.Each vas deferens is about 45 cm or (1.5 ft)Vas deferens carry mature sperm from epididymis for ejaculation.Vasectomy is a procedure of cutting and tying the vas deferens to prevent sperm from reaching the egg.
9UrethraThe urethra is a long narrow tube extending from the bladder to the tip of the penis.It carries urine from the bladder during urination.It also a passageway for semen.Both urine and semen leave the body through the same opening at the tip of the penis.It is a passageway for sperm and fluids from the reproductive system and urine from the urinary system. While reproductive fluids are passing through the urethra, sphincters contract tightly to keep urine from entering the urethra.
10SemenSemen is a sticky, cloudy, whitish fluid composed of sperm from the testes and fluids from prostate gland, seminal vesicle, and Cowper’s gland.Semen exits the penis during ejaculation.
11Erection Involves increase in length, width & firmness of the penis. Changes in blood flow to penis cause erection.The spongy tissue fills with blood causing the penis to stand out from the body.spongy erectile tissue is a loose network of connective tissue with many spacesED – inability to achieve or maintain an erectionAffects approx. 30 mil men in USA. Not unusual to experience sometime – usually due to psychological problems: stress, depression, worrying, griefPhysical problems: nerve damage – usually accompanying diabetes or alcoholismAtherosclerosis [fatty deposits] in arteries supplying penismedications: HTN, antihistamines, antinausea & antiseizure, antidepressants, sedatives, tranquilzersCigarettes, marijuana & alcoholTreat ED – eliminate problem. Medications: Viagra type enhance nitric oxide that is released with arousal and caused arterioles to dilate
12Ejaculation To ejaculate means to suddenly release or let go. Semen leaves the body during ejaculation.Usually ejaculation happens during erection.After ejaculation, the penis becomes soft and it is not erect any more.There are usually about two to five hundred million sperm in a single ejaculation.
14Sperm The sperm cell consists of a head, a body and a tail. The head contains the nucleus which holds chromosomes.The body produces energy molecules needed for the movement of the sperm cell.The tail provides the lashing movements that propel the sperm cell.
15Sperm The sperm cell consists of a head, a body and a tail. The head contains the nucleus which holds chromosomes.The top portion of the head contains acrosome, an enzymes used for penetrating the female egg.The body produces ATP, energy molecules needed for the movement of the sperm cell.The tail or "flagellum" provides the lashing movements that propel the sperm cell.