Embryology and developmental abnormalities.
D005402:Fistula / Q000196:embryology; D006801:Humans; D010280:Parathyroid Glands / Q000196:embryology*; D013955:Thyroglossal Cyst / Q000196:embryology; D013959:Thyroid Diseases / Q000196:embryology; D013961:Thyroid Gland / Q000002:abnormalities* / Q000196:embryology*