residual body of Regaud

re·sid·u·al bod·y of Re·gaud

(rĕ-gō'),
the excess cytoplasm that separates from the spermatid during spermiogenesis.

Regaud,

Claude, French radiologist, 1870-1940.
Regaud fixative - used to preserve mitochondria but not fat.
residual body of Regaud - the excess cytoplasm that separates from the spermatozoon during spermiogenesis.