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histology of the ear

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Created by Qosru Iskandariah HISTOLOGY OF THE EAR Layer External Ear Middle Ear Inner Ear Characteristic 1.Auricle 2.External auditory meatus 3.Tympanic membrane  NB: Their characteristics as in anatomy of ear Lining Epithelium: -Lined by flattened cubical or simple squamous epithelium resting on a thin l amina propria which is strongly adherent to subjacent periosteum -Extends to cover the bony ossicles of middle ear Contents: (3,2,1) 1. 3 bony ossicles -Malleus inserted in tympanic membrane -Incus articulating with malleus and st apes -Stapes inserted in membrane covering t he oval window 2. 2 muscles -Tenser tympani  -Stapedius 3. 1 nerve -Chorda tympani nerve but has no related function to ear Osseous Labyrinth -Consists of a series of connected irregular spaces within petrous portion of temporal bone -Filled with perilymph similar to EC fluid -Formed of the following structures: 1. Cochlea anteriorly 2. Vestibule nuclei centrally (most expanded part and origin of cochlea and semicircular canals) 3. 3 bony semicircular canals  posteriorly Membranous Labyrinth -Formed of continues series of sacs and channels fitted inside bony labyrinth -Filled with endolymph similar to IC fluid -Do not fuse with the bone but suspended by fine fibrous strands thus surrounded by perilymph outside -Formed of the following structures: 1. Cochlea duct fitting in bony cochlea 2. Utricle and saccule fitting in bony vestibule 3. 3 membranous semicircular ducts fitting in 3 bony semicircular canals

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