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Branchial Pouches: 1st Pouch

Branchial Pouch and (1) Wand

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The branchial pouches are found on the endodermal side of the branchial (pharyngeal) apparatus and separates the branchial arches. The 1st branchial pouch develops into the middle ear cavity, the eustachian tube and mastoid air cells. The 1st pouch also contributes to the endoderm lined structures of the ear.

4 KEY FACTS

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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