Appendix epididymis

On the head of the epididymis is a small stalked appendage (sometimes duplicated). It is named the appendix of the epididymis (or pedunculated hydatid), and is usually regarded as a detached efferent duct.
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Appendix /ap·pen·dix/ pl. appen´dices, appendixes [L.] 1. a supplementary, accessory, or dependent part attached to a main structure. 2. [more]Appendix epididymis - Community and Resources

A small cystic projection from the surface of the epididymus which represents a remnant the embryologic mesonephros.