3-middle - Middle Ear Ossicular Chain(1-malleus 2-incus...

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Middle Ear: 4-Tympanic membrane --Middle Ear Space or Tympanum 5- Round Window --Oval Window Ossicular Chain (1-malleus, 2-incus, 3-stapes) --Muscles: (stapedius, tensor tympani) 6- Eustachian Tube
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The TM has three layers: cutaneous, fibrous, radial and concentric circles mucosal
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Ear drum is cone-shaped 135 degree angle most movement in the anterior/inferior portion (the pars tensa).
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The Ossicles Malleus -- Manubrium runs along eardrum Incus -- from ball of malleus to head of stapes (malleus and incus are hung by ligaments so their position and movement are unaffected by head position and gravity) Stapes – connects to oval window (juncture w/ inner ear).
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Two Muscles: Stapedius: innervated by the VIIth Cranial Nerve (the facial nerve) Tensor tympani innervated by the Vth Cranial Nerve (the trigeminal nerve)
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The Stapedius Muscle Attached to head of stapes, pulls posteriorly continuous partial contractions contracts to loud sounds: The Acoustic Reflex:
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attached at superior/frontal portion of malleus manubrium. Contraction pulls
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3-middle - Middle Ear Ossicular Chain(1-malleus 2-incus...

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