Which cells form the muscles of the pharyngeal arches?

Which cells form the muscles of the pharyngeal arches?

• A. Paraxial Mesoderm
• B. Neural Crest Cells
• C. Endoderm
• D. Ectoderm

Answer: (A)

Muscle precursors in the pharyngeal arches come from paraxial mesoderm, the portion of the mesoderm that forms somites and somitomeres in the head. These mesodermal cells migrate into each arch and differentiate into the skeletal muscles associated with that arch. Neural crest cells contribute mainly to the bones, cartilage, and connective tissue of the arches, not the muscles. Endoderm lines the gut and pharyngeal pouches, while ectoderm covers surfaces, but neither forms the arch muscles. So the muscle component of the pharyngeal arches is derived from paraxial mesoderm.

Muscle precursors in the pharyngeal arches come from paraxial mesoderm, the portion of the mesoderm that forms somites and somitomeres in the head. These mesodermal cells migrate into each arch and differentiate into the skeletal muscles associated with that arch. Neural crest cells contribute mainly to the bones, cartilage, and connective tissue of the arches, not the muscles. Endoderm lines the gut and pharyngeal pouches, while ectoderm covers surfaces, but neither forms the arch muscles. So the muscle component of the pharyngeal arches is derived from paraxial mesoderm.