Ear pinna develops from ____________: (A) Ectoderm, (B) Endoderm, (C) Mesoderm, (D) All
Answer is A. Ans:A.)Ectoderm First branchial cleft is the precursor of external auditory canal. Around the sixth week of embryonic life, a series of six tubercles appear around the first branchial cleft Branchial clefts are ectodermal in origin.