Pharyngeal groove

{
  "id": "MLC-T-CHM-008727",
  "term": "Pharyngeal groove",
  "field": "Chemistry",
  "definition": "An external invagination of the ectoderm in a developing vertebrate embryo, located on the outer surface between adjacent pharyngeal arches. These grooves form opposite the internal pharyngeal pouches, which are outpocketings of the endoderm. In mammals, the first pharyngeal groove deepens to form the external auditory meatus (ear canal), while the others normally disappear during development.",
  "subject": "Chemistry and Human Health",
  "see_also": [
    "ectoderm",
    "endoderm",
    "pharyngeal pouch"
  ],
  "references": [
    "PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 791 (https://doi.org/10.1515/pac-2015-1202)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/pharyngeal-groove/"
}