| Name: | pharyngeal arch |
|---|---|
| Synonyms: | pharyngeal arches |
| Definition: | One of a series of paired bony or cartilaginous arches that develop along the lateral walls of the foregut. The pharyngeal arches have developmental contributions from endoderm, mesoderm, and neural crest cells and are separated by anterior lateral endoderm out-pockets known as pharyngeal pouches. There are seven pharyngeal arches. |
| Ontology: | Anatomy Ontology [ZFA:0001306] |
| Name: | ectoderm |
|---|---|
| Synonyms: | |
| Definition: | The outer layer of the embryo derived from the epiblast. The definitive ectoderm will give rise to such tissues as epidermis, the central nervous system, neural crest, and sensory placode. |
| Ontology: | Anatomy Ontology [ZFA:0000016] |