VITELLARY MEMBRANE
\vˈa͡ɪtə͡ləɹi mˈɛmbɹe͡ɪn], \vˈaɪtələɹi mˈɛmbɹeɪn], \v_ˈaɪ_t_əl_ə_ɹ_i m_ˈɛ_m_b_ɹ_eɪ_n]\
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The egg m. formed by the protoplasm of the ovum and immediately surrounding it, in contradistinction to an egg m. formed by the follicular epithelium or the epithelium of the oviduct.
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The investing m. of the vitellus of an ovum. In the fecundated ovum it becomes the chorion. See also zona pellucida.
By Smith Ely Jelliffe
