Efferent ducts

Efferent ducts
Schematic drawing of testicle and epididymis. 1 Tunica albuginea, 2 Septula testis, 3 Lobulus testis, 4 Mediastinum testis, 5 Tubuli seminiferi contorti, 6 Tubuli seminiferi recti, 7 Rete testis, 8 Ductuli efferentes testis, 9 Ductus epididymis, 10 initial part of deferent duct
Vertical section of the testis, to show the arrangement of the ducts. (Labeled as vasa efferentia as top center.)
Latin ductuli efferentes testis
Gray's subject #258 1244
Precursor Wolffian duct

The efferent ducts (or efferent ductules or ductuli efferentes) connect the rete testis with the initial section of the epididymis.

There are two basic designs for efferent ductule structure:

  • a) multiple entries into the epididymis, as seen in most large mammals. In humans and other large mammals, there are approximately 15-20 efferent ducts, which also occupy nearly one third of the head of the epididymis.
  • b) single entry, as seen in most small animals such as rodents, whereby the 3-6 ductules merge into a single small ductule prior to entering the epididymis.

The ductuli are unilaminar and composed of columnar ciliated and non-ciliated (absorptive) cells. The ciliated cells serve to stir the luminal fluids, possibly to help ensure homogeneous absorption of water from the fluid produced by the testis, which results in an increase in the concentration of luminal sperm. The epithelium is surrounded by a band of smooth muscle that helps to propel the sperm toward the epididymis.

Additional images

External links

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Efferent — is an anatomical term with the following meanings: *Conveying away from a center, for example the Efferent arterioles conveying blood away from the Bowman s capsule in the Kidney. Opposite to Afferent. *Something that so conducts, see Efferent… …   Wikipedia

  • Efferent — Carrying away. An artery is an efferent vessel carrying blood away from the heart. An efferent nerve carries impulses away from the central nervous system. The opposite of efferent is afferent. * * * Conducting (fluid or a nerve impulse) outward… …   Medical dictionary

  • efferent — adj. 1) designating nerves or neurones that convey impulses from the brain or spinal cord to muscles, glands, and other effectors; i.e. any motor nerve or neurone. 2) designating vessels or ducts that drain fluid (such as lymph) from an organ or… …   The new mediacal dictionary

  • Prostatic ducts — Latin ductuli prostatici Gray s subject #263 1253 The prostatic ducts (or prostatic ductules) open into the floor of the prostatic portion of the urethra, and are lined by two layers of epithelium, the inner layer consisting of columnar and the …   Wikipedia

  • Epididymis — 1: Epididymis 2: Head of epididymis 3: Lobules of epididymis 4: Body of epididymis 5: Tail of epididymis 6: Duct of epididymis 7: Deferent duct (ductus deferens or vas deferens) …   Wikipedia

  • Development of the urinary and reproductive organs — The development of the urinary and reproductive organs as a part of the prenatal development, concerns the urinary system and sex organs. The latter is a part of the stages of sexual differentiation. The urinary and reproductive organs are… …   Wikipedia

  • Development of the reproductive system — The development of the reproductive system is a part of prenatal development, and concerns the sex organs. It is a part of the stages of sexual differentiation. Because its location to a large extent overlaps the urinary system, the development… …   Wikipedia

  • Urethra — Gray s subject #256 1234 Artery Inferior vesical artery Middle rectal artery Internal pudendal artery Vein …   Wikipedia

  • Testicle — Diagram of male (human) testicles …   Wikipedia

  • Mesonephric duct — Urogenital sinus of female human embryo of eight and a half to nine weeks old …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.