A&P Intro - The Ear is housed within the TEMPORAL...

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The “Ear” is housed within the TEMPORAL BONE
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The Outer Ear Consists of: The Pinna - cartilaginous, highly variable in appearance, some landmarks. External Auditory Canal (or external auditory meatus) - 2.5 cm tube.
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Pinna Landmarks Helix Antihelix Concha Tragus Intertragal Notch Antitragus
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External Auditory Canal lateral portion-cartilage medial portion-osseous lined with epidermal (skin) tissue hairs in lateral part cerumen (ear wax) secreted in lateral part.
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Outer Ear Functions Amplification / Filtering Protection Localization
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The Middle Ear: A cleft within the temporal bone Lining is mucous membrane Tympanic Membrane separates it from EAC Eustachian tube connects it to nasopharynx Also Connected to Mastoid Air Cells
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Middle Ear Structures 1- Malleus 2- Incus --Ossicles 3- Stapes 4- Tympanic Membrane (Eardrum) 5- Round Window 6- Eustachian Tube
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Middle Ear Muscles 1. The Stapedius Attaches to Stapes,Contracts in Response to Loud sounds, chewing, speaking; Facial (VIIth cranial) nerve 2. The Tensor Tympani Helps open Eustachian tube
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Middle Ear Functions Impedance Matching Filtering Acoustic Reflex
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These sounds get through the middle ear most readily
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A&P Intro - The Ear is housed within the TEMPORAL...

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