Testis
There are two ovoid or egged shaped testes whereby each produces sperms and male sex hormones such as testosterone. This male hormones are responsible for the development and maintenance of the secondary sexual characteristics in males. Each testis receives blood from blood vessels in a spermatid cord. From the end of each testis is a narrow, much-coiled tube called the epididymis which stores inactive sperms from the testis before they enter the sperm duct.
Scrotum
The testes lie between the thighs, in a pair of pouch-like sacs called the scortums or scrotal sacs. This scrotal sacs are outside the main body cavity and thus are at a lower temperature than the body. This is essential for the sperms to develop properly. Sperms can only develop at a temperature lower than that of the body.
Sperm Duct
Each sperm duct or vas deferens, loops over a ureter and then opens into the urethra. After sperms are released from a testis, they travel through a sperm duct. The seminal vesicle is gland that opens into each sperm duct. It stores sperms temporarily before they are released through the urethra.
Glands and their secretions
The prostate gland is at the base of the urinary bladder, where then two sperm ducts join the urethra. Beneath the prostate gland is the Cowper's gland. The prostate gland, the seminar vesicles and the Cowper's gland secrete a slippery fluid which mixes with the sperms.This fluid contains nutrients and enzymes which nourish the sperms and activate them,that is, stimulate them to swim actively. The mixture of fluid and sperms is called semen.
Urethra
The urethra is a tube which passes from the bladder through the through the centre of the penis to the outside of the body. Both semen and urine pass out of the body through the urethra. Semen and urine do not pass through the urethra at the same time. This is because of a circular band of muscle called the sphincter muscle at the base of the urinary bladder. The sphincter muscle can be controlled to prevent urine from coming out of the bladder during release of the semen or ejaculation.
The prostate gland is at the base of the urinary bladder, where then two sperm ducts join the urethra. Beneath the prostate gland is the Cowper's gland. The prostate gland, the seminar vesicles and the Cowper's gland secrete a slippery fluid which mixes with the sperms.This fluid contains nutrients and enzymes which nourish the sperms and activate them,that is, stimulate them to swim actively. The mixture of fluid and sperms is called semen.
Urethra
The urethra is a tube which passes from the bladder through the through the centre of the penis to the outside of the body. Both semen and urine pass out of the body through the urethra. Semen and urine do not pass through the urethra at the same time. This is because of a circular band of muscle called the sphincter muscle at the base of the urinary bladder. The sphincter muscle can be controlled to prevent urine from coming out of the bladder during release of the semen or ejaculation.
Penis
The tissue in the penis has numerous spaces that can be filled with blood. When this happens, the penis becomes erect and hard. This allows it to enter the vagina of a woman during sexual intercourse to deposit semen containing sperms. Hence, the penis is an erectile organ. It contains erectile tissue.
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