| The mammary epithelium originates during embryonic development from an epidermal placode. |
| Teeth, hairs, and exocrine glands are organs that develop as appendages of the embryonic surface epithelium through shared placode and bud stages prior to diversification of epithelial morphogenesis. |
| The footplate of the stapes develops and ossifies in conjunction with the otic capsule and thus takes its origin from the otic placode in the embryo. |
| These are lined by a thick layer of nasal epithelium surrounded by the mesenchyme of the placode. |
| In the beginning of the fifth week, the center of the nasal placode sinks to form a nasal groove. |
| The nasal placode is the surface ectoderm becoming thicker in two to three cell layers on frontonasal process. |
