What are the two prominences of the first pharyngeal arch?

• A. Maxillary prominence and Mandibular prominence.
• B. Frontal prominence and Nasal prominence.
• C. Hyoid prominence and Otic prominence.
• D. Temporal prominence and Zygomatic prominence.

Answer: (A)

In early facial development, the first pharyngeal arch forms two swellings that shape the jaw area: the mandibular prominence and the maxillary prominence. The mandibular prominence becomes the lower jaw, while the maxillary prominence forms the upper jaw and midface. So the two prominences associated with the first arch are the mandibular and maxillary prominences. The other options reflect prominences from the frontonasal region (frontal and nasal) or refer to areas not derived from the first arch (such as structures related to the ear or other facial regions), which is why they don’t match the first arch’s two prominences.