(embryology) Either of the second pair of the branchial arch series in vertebrate embryos
In embryology, the hyoid arch pertains to any of the second pair of the branchial arches of vertebrate embryos.
In humans, the hyoid arch forms together with the other three arches by the end of fourth week. Just like the other arches, the hyoid arch is made up of a core of mesoderm surrounded by a layer of endoderm (inner) and ectoderm (outer). It will develop soon into stapes, styloid process, stylohyoid ligament, and lesser cornu of the hyoid bone.