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Fig. 8B. —Drawings show derivatives of second branchial arch. Muscle anlage of second branchial arch gives rise to muscles of facial expression including orbicular muscle of mouth (OM) and of eye (OE), nasal muscle (N), levator muscle of upper lip, greater and lesser zygomatic muscles, buccinator muscle (B), auricular muscles (A), and occipitofrontal muscle (OF). Other muscles that originate from second branchial arch are posterior belly of digastric muscle (PBD), stapedius muscle (S), and stylohyoid muscle (SH).

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