<prompt> In ectodermal dysplasia all of the following structures are affected except:HairNailsTeethSalivary glands  <response>: Note:- Option 4 is correct according to shafer 4th edition. Actually all the 4th options are involved in ectodermal hypoplasia. Hypoplasia of salivary glands with resultant xerostomia is also seen in ectodermal dysplasia. 