Tensor Tympani Origin — MFDS Part 1 MCQ

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HardAnatomy (Head & Neck)Tensor Tympani OriginMFDS Part 1

In a human embryo, a common muscle anlage adjacent to the developing pharyngotympanic tube divides to form the tensor tympani and tensor veli palatini muscles. Within which pharyngeal arch is this anlage located?

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Reveal the answer and explanation

Correct answer: A — First pharyngeal arch

Explanation lettering: D = shown as B · B = shown as D

The correct answer is A, the first pharyngeal arch. Human embryological sections show that tensor tympani and tensor veli palatini initially form a common muscle anlage within the first arch before differentiating. This is consistent with their motor supply through the mandibular division of the trigeminal nerve. The main potential confusion is the stapedius: it is a second-arch muscle and is supplied by the facial nerve, but it is not developmentally grouped with tensor tympani. The third arch principally contributes stylopharyngeus, while the fourth and sixth arches contribute pharyngeal and laryngeal musculature. Therefore, none of B–E accounts for the tensor tympani.

Reference: Rodríguez-Vázquez JF et al. Fetal Tendinous Connection Between the Tensor Tympani and Tensor Veli Palatini Muscles: A Single Digastric Muscle Acting for Morphogenesis of the Cranial Base. Anatomical Record. 2016;299(4):474–483. https://pubmed.ncbi.nlm.nih.gov/26744237/