Discussion
A pinna is formed during embryonic
life from six tiny hillocks, at the dorsal end
of the first (mandible) and second (hyoid)
branchial arch.Failure of fusion at the fourth
week of gestation causes of accessory auricles
or polyotia. The first hillock forms the tragus,
the second and third hillocks form the anterior
crus of the helix while the fourth and fifth