The 1st branchial pouch contributes to the endoderm-lined structures of the ear, such as the outer layer of the tympanic membrane and inner layer of the pharyngotympanic eustachian tube.
The 1st pouch develops into the middle ear cavity.
This branchial pouch also develops into the eustachian tube.
The mastoid air cells (mastoid antrum) describes the air space in the bony portion of the temporal bone.
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