Eardrum Or Tympanic Membrane

The eardrum is made up of (a) ectodermal epithelial lining at the bottom of the auditory meatus, (b) endodermal epithelial lining of the tympanic cavity, and (c) an intermediate layer of connective tissue (Fig. 16.9B) that forms the fibrous stratum. The major part of the eardrum is firmly attached to the handle of the malleus (Fig. 16.8 and 16.9B), and the remaining portion forms the separation between the external auditory meatus and the tympanic cavity.

Roof of rhombencephalon

Endolymphatic duct

Utricular portion of otic vesicle

Saccular portion

Mesenchymal condensation

1st pharyngeal cleft

Roof of rhombencephalon

Utricular portion of otic vesicle

Saccular portion

Mesenchymal condensation

1st pharyngeal cleft

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