Preauricular sinus is formed due to
Improper fusion of auricular tubercles
Persistent opening of first bronchial arch
Degeneration of auricular tubercles
None of the above
Preauricular appendages form due to development of accessory hillocks where as preauricular sinus/pits occur due to abnormal development of auricular tubercles/hillocks(six mesodermal thickenings) REFERENCE: TEXTBOOK OF CLINICAL EMBRYOLOGY... VISHRAM SINGH SECOND EDITION..PAGE NO:312
General anatomy