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29 Cards in this Set
- Front
- Back
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Anterior
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Front
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Posterior
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Back
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Inferior
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Bottom
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Superior
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Top
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Lateral
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away from the middle of the body
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Medial
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toward the middle of the body
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Sinister
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left hand
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Dexter
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right hand
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Temporal bones
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one on each side of the skull
house the peripheral auditory protect the fine structures of the inner ear |
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Hardest bone in the body
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petrous portion
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temporal bone
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very strong/ hard to break
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Parts of the outer ear
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Pinna
External auditory |
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Pinna
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arch of the ear
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External auditory canal
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to tympanic membrane
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mastoidectomy
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taken out and bone removed causes hearing loss
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mastoid air cells
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if they get infected bad news and hard to remember
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darwins tubical
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bump on pinna ear -- variation
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Parts of the Pinna (Auricle)
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Helix
Crus of the Helix Antihelix Tragus Antitragus Intertragal notch Concha Lobe |
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External auditory meatus
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approximately 28 mm Long (around 1in)
curved irregularly shaped (s- shaped) 7 mm In diameter |
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EAM
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two portions
Outer (lateral) is cartilaginous (2/3) Inner (medial) is osseous (1/3) Isthmus is the narrowest part of canal at junction of cartilaginous and osseous portions |
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Isthmus
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is the narrowest part of canal at junction of cartilaginous and osseous portions
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Isthmus
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connects cartilaginous and osseous portions
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Cartilaginous EAC
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Lateral portion -- is continuous with cartilage of pinna
Covered with thick skin Contains sebaceous glands, ceruminous glands, hairs but no sweat glands |
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skin of EAC
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does not contain sweat glands
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cartilaginous wax- producing glands
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only found in lateral (cartilaginous) portion of EAC
Sebaceous glands secrete an oily substance called sebum sebum combines with secretions of cereminous glands and keratin (protein that partially makes up skin) to produce "ear wax" known as CERUMEN |
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Cerumen
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lubricates the ear canal
protects the medial EAC from foreign objects |
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sebum
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combines with secretions of cereminous glands and keratin (protein that partially makes up skin) to produce "ear wax" known as CERUMEN
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types of ear wax
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2 different types of ear wax genetically
the wet type is dominant and dry type is recessive |
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Medial portion of EAC
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Bony (osseous)- from squamous and tympanic portions of temporal bone
very thin skin diameter not as variable as that of cartilaginous portion of EAC Also covered with skin (epithelial tissue) very think (0.2 mm) easily traumatized continuous with the lateral layer of the tympanic membrane |
