Tympanic membrane develops from:
1.Ectoderm
2.Mesoderm
3.Endoderm
4.All the three germinal layers
5.Only a and c
sol:
Tympanic membrane develops from all the three germinal layers.
Outer epithelial layer develops from epithelium lining the first branchial cleft.
Inner mucosaI layer develops from the lining of tubotympanic recess which is a derivative of first pharyngeal pouch and partly of the second pouch.
Intermediate fibrous layer i derived from mesoderm.