Repeated USMLE Questions Step 1- 311

A 32-year-old man visits his physician for a follow up after receiving a punch to the right side of his face. He complains of difficulty to chew food on the right side. Examination reveals possible injury to muscles of mastication.

Muscles of mastication are derived form which of these structures?

A-Branchial Arch 1

B-Branchial Arch 2

C-Branchial Arch 3

D-Branchial Arch 4

E-Branchial Arch 5

Answer



Muscles of mastication are derived from branchial arch 1. Arch 2 gives rise to muscles of facial expression while muscles of the pharynx and larynx are derived from arches 3-6.

The correct answer is A


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