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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.
Farlex Partner Medical Dictionary © Farlex 2012
visceral archesthe skeletal structures lying between adjacent gill slits in vertebrates, or the division between the gill slits.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005