The vas deferens is a muscular tube (duct) which carries sperm cells from the epididymis to the ejaculatory duct. The muscular wall is remarkably thick in proportion to the diameter of the lumen. The muscle is organized indistinctly into three layers -- inner and outer layers of mostly longitudinal smooth muscle fibers and a middle layer of mostly circular fibers.
The lumen of the vas is lined by a pseudostratified columnar epithelium with apical stereocilia, similar to that lining the epididymis.
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Last updated: 6 March 2002 / dgk