What does the first pharyngeal membrane form?

What does the first pharyngeal membrane form?

• A. Tympanic membrane of the ear
• B. External auditory canal skin
• C. Malleus
• D. Eustachian tube

Answer: (A)

The first pharyngeal membrane forms the tympanic membrane of the ear. This boundary between the first pharyngeal groove (outer skin of the ear canal) and the first pharyngeal pouch (middle ear cavity) gives rise to the tympanic membrane, which has three layers: an outer epidermal layer from the groove, a middle fibrous layer from the first arch mesenchyme, and an inner mucous layer from the pouch. The skin of the external auditory canal comes from the groove itself, the malleus from the first pharyngeal arch, and the Eustachian tube from the first pharyngeal pouch.

The first pharyngeal membrane forms the tympanic membrane of the ear. This boundary between the first pharyngeal groove (outer skin of the ear canal) and the first pharyngeal pouch (middle ear cavity) gives rise to the tympanic membrane, which has three layers: an outer epidermal layer from the groove, a middle fibrous layer from the first arch mesenchyme, and an inner mucous layer from the pouch.

The skin of the external auditory canal comes from the groove itself, the malleus from the first pharyngeal arch, and the Eustachian tube from the first pharyngeal pouch.