archoplasm
noun
the protoplasmic material surrounding the centrosome, formerly thought to be involved in the formation of the asters and spindle during mitosis
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Spermatids in different stages; a1, archoplasmic material from first spermatocyte spindle, a2 archoplasmic material from second maturation spindle.
From Studies in Spermatogenesis Part II by Nettie Maria Stevens