tunica vaginalis testis
(văj′ə-nā′lĭs tĕs′tĭs)- The serous sheath of the testis and epididymis, derived from the peritoneum, and consisting of an outer and inner serous layer.
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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.