(i) Nucleus of spermatid shrinks to form sperm head.
(ii) Acrosome is formed from the glomerulus of spermatid and rests like a cap on the head of the spermatozoa.
(iii) Mitochondria of spermatids form the nucleus of the sperm.
(iv) Centriole of spermatids forms axial filament and tail of sperm.