Efferent ducts

 ( Scrotum ) 

The efferent ducts (also efferent ductules, ductuli efferentes, ductus efferentes, or vasa efferentia) connect the rete testis with the initial section of the epididymis.Hess 2018

There are two basic designs for efferent ductule structure:

• a) multiple entries into the epididymis, as seen in most large mammals. In and other large , there are approximately 15 to 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 , whereby the 3–6 ductules merge into a single small ductule before 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 increases 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==

• List of distinct cell types in the adult human body

• – "Mammal, testis overview"
• – "Inguinal Region, Scrotum and Testes: Reflection of the Head of the Epididymis"
• Diagram/Quiz (cancer.gov)
• researchgate

Hess RA 2018. Efferent ductules: structure and function. Encyclopedia of Reproduction. Skinner MK. San Diego, Academic Press: Elsevier. 1: 270–278.