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Hyoid Arch
(redirected from Second branchial arch)

   Also found in: Dictionary/thesaurus, Medical, Wikipedia 0.01 sec.
hyoid arch [′hī‚ȯid ‚ärch]
(embryology)
Either of the second pair of pharyngeal segments or gill arches in vertebrate embryos.

Hyoid Arch 

part of the visceral skeleton in vertebrates, including man, located directly behind the maxillary arch. In most cartilaginous fishes, each half of the hyoid arch consists of a superior hyoid cartilage and an inferior hyoid cartilage. Both halves of the hyoid arch unite below in an unpaired element. In bony fishes the superior element of the hyoid arch, which bears the gill cover, is segmented into the suspensorium proper and a connective bone; the hyoid bears rays of the branchiostegal membrane. The unpaired connective element of the hyoid arch is covered with a mucous membrane (the tongue of fishes) and is often equipped with teeth. In most terrestrial vertebrates, including man, the suspensorium is converted into an auditory ossicle known as the stapes, whereas the inferior element becomes part of the hyoid apparatus.



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1) They are derived from different embryologic cell anlages: the epibranchial placode of the second branchial arch and the neural crest of the facial primordium, respectively.
In the event that the vertical segment of the ICA regresses or does not develop, a communication persists between it and the external carotid artery, which is derived from the second branchial arch.
During closure of the cervical sinus that lies between the second branchial arch and the epipericardial ridge, ectoderm may become trapped, resulting in the formation of an inclusion or cyst.
 
 
 
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