Which tissue forms the mandible?

Which tissue forms the mandible?

• A. Neural crest-derived tissue
• B. Mesodermal tissue
• C. Endodermal tissue
• D. Ectodermal placode tissue

Answer: (A)

The mandible forms from neural crest–derived mesenchyme that populates the first pharyngeal arch (the mandibular arch). These ectomesenchymal cells migrate into that arch and differentiate into the bones of the mandible through intramembranous ossification, with Meckel’s cartilage acting only as a transient scaffold in early development. The other germ layers contribute to different tissues in the head: mesoderm largely supplies muscles and some other structures, endoderm lines internal surfaces, and ectodermal placodes contribute to certain sensory elements, but the mandible bone itself comes from neural crest–derived tissue.

The mandible forms from neural crest–derived mesenchyme that populates the first pharyngeal arch (the mandibular arch). These ectomesenchymal cells migrate into that arch and differentiate into the bones of the mandible through intramembranous ossification, with Meckel’s cartilage acting only as a transient scaffold in early development. The other germ layers contribute to different tissues in the head: mesoderm largely supplies muscles and some other structures, endoderm lines internal surfaces, and ectodermal placodes contribute to certain sensory elements, but the mandible bone itself comes from neural crest–derived tissue.