tail of spermatozoon

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any slender appendage; called also cauda.
tail of spermatozoon the flagellum of a spermatozoon; it has four regions: the neck, middle piece, principal piece, and end piece.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.