pharyngeal groove

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a narrow, linear hollow or depression.
branchial groove pharyngeal groove.
Harrison's groove a horizontal groove along the lower border of the thorax corresponding to the costal insertion of the diaphragm; seen in advanced rickets in childhood.
medullary groove (neural groove) that formed by the beginning invagination of the neural plate of the embryo to form the neural tube.
pharyngeal groove a groove between a pair of pharyngeal arches in a mammalian embryo, homologous to the branchial cleft of a fish, formed by rupture of the membrane separating a corresponding entodermal pouch and ectodermal groove.

pha·ryn·ge·al groove

(făr-in'jē-ăl grūv)
The ectodermal groove between two pharyngeal arches in the human embryo.
Synonym(s): branchial cleft, pharyngeal cleft.