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The vas deferens (plural: vasa deferentia), also called ductus deferens, (Latin
Latin

Latin is an Italic language, historically spoken in Latium and Ancient Rome. Through the Military history of the Roman Empire, Latin spread throughout the Mediterranean and a large part of Europe....
: "carrying-away vessel") is part of the male
Malé

Mal? , population 104,403 , is the Capital , the largest city in terms of population, and the name of an island in the Maldives. It is located at the southern edge of North Male' Atoll Kaafu Atoll....
 anatomy
Anatomy

Anatomy is a branch of biology that is the consideration of the body plan. It is a general term that includes human anatomy, animal anatomy and plant anatomy ....
 of some species; they transport sperm
Sperm

The term sperm is derived from the Greek word sperma and refers to the male reproductive Cell . In the types of sexual reproduction known as anisogamy and oogamy, there is a marked difference in the size of the gametes with the smaller one being termed the "male" or sperm cell....
 from the epididymis
Epididymis

The epididymis is part of the male reproductive system and is present in all male mammals. It is a narrow, tightly-coiled tube connecting the efferent ducts from the rear of each testicle to its vas deferens....
 in anticipation of ejaculation
Ejaculation

Ejaculation is the ejecting of semen from the penis, and is usually accompanied by orgasm. It is usually the result of sexual stimulation. Rarely, it is due to prostatic disease....
.

e are two such ducts, connecting the left and right epididymis
Epididymis

The epididymis is part of the male reproductive system and is present in all male mammals. It is a narrow, tightly-coiled tube connecting the efferent ducts from the rear of each testicle to its vas deferens....
 to the ejaculatory duct
Ejaculatory duct

The Ejaculatory ducts are paired structures in male anatomy, about 2 cm in length.Each ejaculatory duct is formed by the union of the vas deferens with the Excretory duct of seminal gland....
s in order to move sperm
Spermatozoon

A sperm, from the ancient Greek word sp???a and and more commonly known as a sperm cell, is the ploidy cell that is the male gamete. It Fertilization an ovum to form a zygote....
. Each tube is about 30 centimeters long (in humans) and is muscular (surrounded by smooth muscle
Smooth muscle

Smooth muscle is a type of non-striated muscle, found within the tunica media layer of large and small arteries and veins, the urinary bladder, uterus, male and female reproductive tracts, gastrointestinal tract, respiratory tract, the ciliary muscle, and iris of the eye....
).

They are part of the spermatic cord
Spermatic cord

The spermatic cord is the name given to the cord-like structure in males formed by the vas deferens and surrounding tissue that run from the abdomen down to each testicle....
s.

ng ejaculation
Ejaculation

Ejaculation is the ejecting of semen from the penis, and is usually accompanied by orgasm. It is usually the result of sexual stimulation. Rarely, it is due to prostatic disease....
 the smooth muscle in the walls of the ductus deferens or vas deferens contracts reflexively, thus propelling the sperm forward.






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Encyclopedia


The vas deferens (plural: vasa deferentia), also called ductus deferens, (Latin
Latin

Latin is an Italic language, historically spoken in Latium and Ancient Rome. Through the Military history of the Roman Empire, Latin spread throughout the Mediterranean and a large part of Europe....
: "carrying-away vessel") is part of the male
Malé

Mal? , population 104,403 , is the Capital , the largest city in terms of population, and the name of an island in the Maldives. It is located at the southern edge of North Male' Atoll Kaafu Atoll....
 anatomy
Anatomy

Anatomy is a branch of biology that is the consideration of the body plan. It is a general term that includes human anatomy, animal anatomy and plant anatomy ....
 of some species; they transport sperm
Sperm

The term sperm is derived from the Greek word sperma and refers to the male reproductive Cell . In the types of sexual reproduction known as anisogamy and oogamy, there is a marked difference in the size of the gametes with the smaller one being termed the "male" or sperm cell....
 from the epididymis
Epididymis

The epididymis is part of the male reproductive system and is present in all male mammals. It is a narrow, tightly-coiled tube connecting the efferent ducts from the rear of each testicle to its vas deferens....
 in anticipation of ejaculation
Ejaculation

Ejaculation is the ejecting of semen from the penis, and is usually accompanied by orgasm. It is usually the result of sexual stimulation. Rarely, it is due to prostatic disease....
.

Structure

There are two such ducts, connecting the left and right epididymis
Epididymis

The epididymis is part of the male reproductive system and is present in all male mammals. It is a narrow, tightly-coiled tube connecting the efferent ducts from the rear of each testicle to its vas deferens....
 to the ejaculatory duct
Ejaculatory duct

The Ejaculatory ducts are paired structures in male anatomy, about 2 cm in length.Each ejaculatory duct is formed by the union of the vas deferens with the Excretory duct of seminal gland....
s in order to move sperm
Spermatozoon

A sperm, from the ancient Greek word sp???a and and more commonly known as a sperm cell, is the ploidy cell that is the male gamete. It Fertilization an ovum to form a zygote....
. Each tube is about 30 centimeters long (in humans) and is muscular (surrounded by smooth muscle
Smooth muscle

Smooth muscle is a type of non-striated muscle, found within the tunica media layer of large and small arteries and veins, the urinary bladder, uterus, male and female reproductive tracts, gastrointestinal tract, respiratory tract, the ciliary muscle, and iris of the eye....
).

They are part of the spermatic cord
Spermatic cord

The spermatic cord is the name given to the cord-like structure in males formed by the vas deferens and surrounding tissue that run from the abdomen down to each testicle....
s.

Function in ejaculation

During ejaculation
Ejaculation

Ejaculation is the ejecting of semen from the penis, and is usually accompanied by orgasm. It is usually the result of sexual stimulation. Rarely, it is due to prostatic disease....
 the smooth muscle in the walls of the ductus deferens or vas deferens contracts reflexively, thus propelling the sperm forward. This is also known as peristalsis. The sperm is transferred from the vas deferens into the urethra, collecting secretions from the male accessory sex glands such as the seminal vesicles, prostate gland and the bulbourethral glands, which form the bulk of semen.

Significance in contraception

The procedure of deferentectomy, also known as a vasectomy
Vasectomy

Vasectomy is a surgical procedure in which the vas deferens of a man are cut for the purpose of Sterilization ....
, is a method of contraception in which the vasa deferentia (Latin plural) are permanently cut, though in some cases it can be reversed. A modern variation, which is also known as a vasectomy even though it does not include cutting the vas, involves injecting an obstructive material into the ductus to block the flow of sperm. In either procedure, active sperm may be still be present in the seminal vesicles for as long as 12 weeks.

Investigational attempts for male contraception have focused on the vas with the use of the intra vas device and reversible inhibition of sperm under guidance
Reversible inhibition of sperm under guidance

Reversible Inhibition of Sperm Under Guidance , formerly referred to as SMA, is the development name of a male contraceptive developed at IIT in India by Dr....
 (RISUG).

Blood supply

The vas deferens is supplied by an accompanying artery (artery of vas deferens). This artery normally arises from the inferior vesical artery, a branch of the internal iliac artery.

Additional images


See also


  • Vasectomy
    Vasectomy

    Vasectomy is a surgical procedure in which the vas deferens of a man are cut for the purpose of Sterilization ....
  • Intra vas device
  • Cystic fibrosis
    Cystic fibrosis

    Cystic Fibrosis is a Genetic disorder affecting the exocrine glands of the lungs, liver, pancreas, and intestines, causing progressive disability due to multisystem failure....
  • Excretory duct of seminal gland
    Excretory duct of seminal gland

    Each seminal vesicle consists of a single tube, coiled upon itself, and giving off several irregular cecal diverticula; the separate coils, as well as the diverticula, are connected together by fibrous tissue....


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