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epididyme, one of two people of a pair that elongated crescent-shaped frameworks attached to every of the 2 male reproductive organs, the testes (see testis). Sperm cells created in the testes are transported to the epididymes, where they mature and are stored. Each epididymis has three regions, called, respectively, the head, body, and also tail. The head is the uppermost and also largest part of the epididymis; that lies on the peak surface that the testis. The body is attached to the anal side of the testis and also extends the size of the gland. The smallest an ar is the tail, which begins at the allude of separation the the epididymis from the testis. Sperm cells mature mostly in the head and body that the epididymis and are stored in the tail.

The epididymis receive sperm from the tubules in the mediastinum testis, the an ar in the testis in which all its sperm-producing tubules converge and empty. Top from the mediastinum come the head the the epididymis room 15–20 small, strict coiled ducts called the ductuli efferentes. The cells lining the ductuli have pigment granules, secretory granules, and also cilia (hairlike structures). In the head an ar of the epididymis, every the ductuli efferentes attach to one big vessel, the ductus epididymidis. This duct is also extremely coiled, being about 4 come 5 m (13 to 16 feet) long when extended out. The ductus epididymidis extends through both the body and also the tail region of the epididymis. In the tail an ar it i do not care thicker, much less coiled, and larger in diameter. Together it emerges from the end of the epididymis, that straightens the end to kind the ductus deferens.



The epididymis, ductus deferens (or vas deferens), and also ejaculatory ducts form the sperm canal. With each other they extend from the testis to the...

During ejaculation, sperm are driven through the ductuli efferentes and ductus epididymidis in two ways. First, the muscle tissue, through contracting, narrows the ducts, propelling the sperm. Second, the cilia situated in the ductuli efferentes have the right to propel sperm through their regular swaying motions. As sperm pass v the various ducts, lock acquire little amounts of fluids that help to save them alive. These secretions encompass high concentrations of potassium, sodium, and a substance well-known as glycerylphosphorylcholine, which is one energy source for sperm.

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This article was most recently revised and also updated by Kara Rogers, senior Editor.