INBDE (Integrated National Board Dental Examination) Practice Exam

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What skeletal structures arise from arch 3?

Lower half of hyoid body and greater horns
Upper half of hyoid body and lesser horns
Mandible and maxilla
Stapes and styloid process

The correct answer is: Lower half of hyoid body and greater horns

Arch 3 is also known as the third pharyngeal arch and develops during fetal development. It gives rise to specific skeletal structures, such as the lower half of the hyoid bone and the greater horns. These structures are formed by the fusion of the third branchial arch with the third and fourth pharyngeal arches. The other options listed are parts of the mandibular and hyoid arches, which do not arise from arch 3. The mandible and maxilla are derived from the first pharyngeal arch, while the stapes and styloid process come from the second pharyngeal arch. Therefore, A is the correct answer as it accurately describes the skeletal structures that arise from arch 3.