4 ‚§√ß √â“ߢÕßÀŸ™—Èπ°≈“ß (Middle ear) ÀŸ™—Èπ°≈“ß π—Èπ‡√‘Ë¡®“°‡¬◊ËÕ∫ÿ·°â«ÀŸ ·≈– à«πΣ’Ë‡ªìπ™àÕß«à“ßΣ’Ë¡’°√–¥Ÿ°‡≈Á°Ê 3 ™‘Èπ∫√√®ÿÕ¬Ÿà §◊Õ °√–¥Ÿ°¶âÕπ (Malleus) Σ—Ëß (Incus) ·≈–°√–¥Ÿ°‚°≈π (Stapes) ´÷ËßΣ—Èß 3 ™‘Èππ’È«“ßμ—«‡√’¬ß °—π·≈–‡ªìπμ—«π”§≈◊Ëπ‡ ’¬ßºà“π‰ª ŸàÀŸ™—Èπ„πμàÕ‰ª ™àÕßÀŸ™—Èπ°≈“ßπ—Èπ¡’§«“¡®ÿ 1-2 ≈∫.´¡. ·≈–¡’Σ“ß‡ªî¥μ‘¥μàÕ°—∫Õ«—¬«– à«πÕ◊ËπÊ §◊Õ Σ“ß ¥â“πÀπâ“μ‘¥μàÕ°—∫ΣàÕ¬Ÿ ‡μ‡™’¬π (Eustachian tube) à«π¥â“πÀ≈—ßμ‘¥μàÕ°—∫ Mastoid air cell ·≈–μ‘¥μàÕ°—∫ÀŸ™—Èπ„πΣ“ßÀπâ“μà“ß√Ÿª‰¢à (Oval window) ·≈–√Ÿª°≈¡ ´÷ËßÀπâ“μà“ß√Ÿª°≈¡®–¡’ ·ºàπ‡¬◊ËÕ∫“ßÊ ªî¥Õ¬Ÿà ‡√’¬°«à“‡ªìπ Secondary Tympanic membrane °“√欓∫“≈ ÀŸ §Õ ®¡Ÿ° √ŸªΣ’Ë 4 ·°â«ÀŸª°μ‘ Σ’Ë¡“ : Sigler, B.A. and Schuring, L.T. Ear, Nose and Throat Disorders. St. Louis: Mosby-Yearbook, Inc., 1993, p.21.
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