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Branchial Pouches: 1st Pouch

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Branchial Pouches: 1st Pouch

Branchial Pouch and (1) Wand
Picmonic
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
Endoderm Lines the Auditory Tube
Indoor-deer in Auditory Tube

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.

Middle Ear Cavity
Metal Ear Cavity

The 1st pouch develops into the middle ear cavity. 

Eustachian Tube
Ear-radio-station Tube

This branchial pouch also develops into the eustachian tube.

Mastoid Air Cells
Mustard Air Cells

The mastoid air cells (mastoid antrum) describes the air space in the bony portion of the temporal bone.

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