Immature ovum

Immature ovum
Anatomical terminology

An immature ovum is a cell that goes through the process of oogenesis to become an ovum. It can be an oogonium, an oocyte, or an ootid. An oocyte, in turn, can be either primary or secondary, depending on how far it has come in its process of meiosis.

Cell typeploidy/chromosomeschromatidsProcessProcess completion
Oogoniumdiploid/462COocytogenesis (mitosis)third trimester
primary Oocytediploid/464COotidogenesis (meiosis 1) (Folliculogenesis) -- polar body separatedDictyate in prophase I until ovulation
secondary Oocytehaploid/232COotidogenesis (meiosis 2) -- polar body separatedHalted in metaphase II until fertilization
Ootidhaploid/231CMaturationMinutes after fertilization
Ovumhaploid/231C
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