Maxilla Ossification — MFDS Part 1 MCQ
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Correct answer: A — Maxilla
The correct answer is A, the maxilla. It develops directly within mesenchyme by intramembranous ossification and does not require a cartilage model. The mandible is predominantly intramembranous, particularly in its body and ramus, but it is a composite bone with endochondral contributions from cartilage-associated regions, especially the condylar region. The temporal bone also has mixed development, including endochondral components. The sphenoid develops through both endochondral and intramembranous pathways. The ethmoid arises from the cartilaginous nasal capsule and anterior cranial base and therefore has an endochondral developmental component. The original parenthetical description beside the mandible was removed because it cued the answer, and the claim that the coronoid process itself develops endochondrally has not been retained.
Reference: Chen B, Zhang Y, Liu O. MicroRNAs in maxillofacial bone modeling and remodeling: implications for malocclusion development and orthodontic treatment. Figure 1 and accompanying text. Front Cell Dev Biol. 2024;12:1355312. https://pubmed.ncbi.nlm.nih.gov/38544821/