Ectodermal dysplasia impacts all of the following structures except:___________?
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Answer: B. Nails
Explanation
Ectodermal dysplasia primarily affects ectoderm-derived structures such as hair, teeth, and sweat glands. Nails are frequently abnormal in this condition, making the question a nuanced technical inquiry. Embryologically, both the epidermis and its appendages share a common ectodermal developmental origin. Ectodermal dysplasias comprise a large, heterogeneous group of inherited disorders defined by congenital developmental defects. Hypohidrotic ectodermal dysplasia is the most common form, characterized by diminished ability to sweat. Affected individuals frequently display distinctive facial features, sparse hair, and severe oligodontia.
Lifelong management requires multidisciplinary dental and medical care to address missing teeth and thermoregulatory issues. Prosthetic rehabilitation significantly improves masticatory function, speech, and psychosocial well-being for growing patients. Preventing hyperthermia is a crucial daily precaution for patients lacking normal functional sweat gland distribution. Hair is an ectodermal derivative that presents with marked hypotrichosis in affected individuals. Teeth develop from oral ectoderm and neural crest mesenchyme and are severely impacted by the disorder. Salivary glands also originate from surface ectoderm and can exhibit functional deficiencies in these patients.
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