| The term iteration is used to denote processes that result in both metameric segments and repeated ectodermal skeletal structures. |
| The apical ectodermal ridge consists of closely packed columnar epithelial cells, which are linked by extensive gap junctions. |
| Clouston syndrome is an hidrotic form of ectodermal dysplasia, inherited as an autosomal dominant trait with high penetrance. |
| The most interesting and most perplexing question is how ectodermal glands can be derived from what has been thought to be endodermal and mesodermal derivatives. |
| They are made up predominantly of ectodermal components and have a large cystic component. |
| A mesenchymal signal triggers an ectodermal cell to proliferate and the cells grow downward to form a hair germ. |
