pharyngeal arches


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Related to pharyngeal arches: Pharyngeal pouches

pharyngeal arches

1. obliquely disposed, rounded ridges on either side of the head and neck of human embryos during the fourth and fifth gestational weeks, which contribute to formation of the face and neck.
2. aggregate of the pharyngeal arches, pouches, grooves, and membranes seen in the developing embryo of vertebrates.

pha·ryn·ge·al arch·es

(făr-in'jē-al ahrch'ĕz)
Obliquely disposed, rounded ridges on either side of the head and neck of human embryos during fourth and fifth gestational weeks, which contribute to formation of face and neck.
References in periodicals archive ?
Notice that dorsal elements in all pharyngeal arches are deleted at lower concentrations of RA than more ventral elements.
13) (It is interesting that velocardiofacial syndrome sequence deletions appear to be similar to those noted in DiGeorge syndrome, which is linked to malformations of the fourth and fifth pharyngeal arches.
The remaining posterior one-third of the tongue arises from a second swelling (the hypobranchial eminence or copula), which is made up of mesoderm of the second, the third, and a portion of the fourth pharyngeal arches.