Preauricular sinus is formed due to
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
Improper fusion of auricular tubercles
Persistent opening of first bronchial arch
Degeneration of auricular tubercles
None of the above
General anatomy