The appendix of the epididymis (or pedunculated hydatid) is a small stalked appendage (sometimes duplicated) on the head of the epididymis.

It is usually regarded as a detached efferent duct.

This structure is derived from the Wolffian duct (mesonephric duct) as opposed to the appendix testis which is derived from the Müllerian duct (paramesonephric duct) remnant.

This article incorporates text in the public domain from page 1242 of the 20th edition of Gray's Anatomy (1918)

This article related to the genitourinary system is a stub.