Pharyngeal groove

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Pharyngeal groove
Pattern of the branchial arches. I-IV branchial arches, 1-4 branchial pouches (inside) and/or pharyngeal grooves (outside)
a Tuberculum laterale
b Tuberculum impar
c Foramen cecum
d Ductus thyreoglossus
e Sinus cervicalis
Gray's subject #13 65
Dorlands/Elsevier g_12/12402747

A pharyngeal groove (or cleft) is the counterpart of the branchial pouch on the ectodermal side.

The first pharyngeal groove produces the ear canal.[1]

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branchial arch

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