Internal sexual and reproductive organs

Testes are the two oval glands located in the scrotum, each about 5 cm in length and 2.5 cm in width and weighing about 10-15 gm. Testes produce male sex hormones and androgens. The other male hormone, testosterone, is secreted by the Leydig’s cells that are located between the seminiferous tubules. Testes also produce and store semen. Semen consists of both sperms as well as seminal fluid that is secreted by the seminal vesicles and the prostrate gland. The average volume of semen for each ejaculation is 2.5 ml.

The epididymis and the vas deferens are tubes or ducts through which sperm travels to the penis.

The seminal vesicles are small glands, each about 2 inches long, which are located behind the bladder and open into the ejaculatory ducts.

The prostate gland lies beneath the bladder and secretes prostatic fluid, which gives semen its characteristic odour and texture.

Cowper’s glands, lie below the prostate and empty their secretions into the urethra during sexual arousal.

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