nucleus
membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated
macronucleus
type of nucleus in ciliates, involved in non-reproductive cell functions
pronucleus
The nucleus of either the ovum or the spermatozoon following fertilization. Thus, in the fertilized ovum, there are two pronuclei, one originating from the ovum, the other from the spermatozoon that brought about fertilization; they approach each oth
micronucleus
type of nucleus in ciliates, involved in reproductive cell functions
ventral nuclear group
large group of nuclei lying between the internal medullary lamina and the internal capsule