Question

Identify the structure marked in the image.

• A. Fossa of Rosenmuller
• B. Tubal tonsil
• C. Opening of the Eustachian tube
• D. Adenoid

Answer 1

The Correct Option is A

The structure marked in the given image is identified as the Fossa of Rosenmuller. Below is an explanation of each option to confirm why the Fossa of Rosenmuller is the correct answer:

• Fossa of Rosenmuller: This is a deep recess located posterior to the torus tubarius and lateral to the pharyngeal opening of the Eustachian tube. It is a common site for the origin of nasopharyngeal carcinoma.
• Tubal tonsil: This is a collection of lymphoid tissue located near the pharyngeal opening of the Eustachian tube, not within any marked deep recess.
• Opening of the Eustachian tube: This is the entrance to the Eustachian tube, located anterior to the Fossa of Rosenmuller; hence it cannot be the marked deep structure.
• Adenoid: This is a mass of lymphoid tissue located in the roof and posterior wall of the nasopharynx; it does not match the typical description of a fossa and is not marked in such a manner.

Considering these definitions and characteristics, the structure marked in the image corresponds to the Fossa of Rosenmuller.