MASTOID CELLS
\mˈastɔ͡ɪd sˈɛlz], \mˈastɔɪd sˈɛlz], \m_ˈa_s_t_ɔɪ_d s_ˈɛ_l_z]\
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By William R. Warner
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These are situate in the mastoid process; communicate with each other, and open into the cavity of the tympanum. Their use seems to be to increase the intensity of sound.
By Robley Dunglison
By Willam Alexander Newman Dorland
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Cellular spaces in the inside of the mastoid process, communicating with each other, through the mastoid antrum with the tympanic cavity, and through the latter and the eustachian tube with the nasopharynx, and lined with mucous membrane continuous with that of the respiratory tract. They are developed after puberty and their size and number vary in individuals.
By Smith Ely Jelliffe