Ectodermal Placodes

**Definition:** A series of thickened ECTODERM patches in the developing cranial region that appears during week 4 in human embryo. Ectodermal placodes are the primordium of many ectodermal sensory systems including the INNER EAR, the EYE LENS, the OLFACTORY EPITHELIUM, as well as the PITUITARY GLAND and THYROID GLAND.

**Tree numbers:** - A16.216

**Synonyms:** - Cranial Ectodermal Placodes