pharyngeal arches

term used to denote the branchial arches (q.v.) in human embryos. The first and second pharyngeal arches (qq.v.) contribute to the formation of the upper and lower jaws and the hyoid bone. The third pharyngeal arch develops into the greater horn of the hyoid bone and the caudal part of its body; the fourth and sixth arches develop into the laryngeal cartilages. In the human embryo, the sixth arch is actually the fifth in number but is so named for reasons of comparative anatomy and evolution; it does not appear on the surface.

Pharyngeal arches in a stage 13, 4.5-week-old embryo.


Medical dictionary. 2011.

Look at other dictionaries:

  • pharyngeal tooth count — pharyngeal tooth counts (of Cyprinidae) are presented in a formula from the outer to the inner rows of the left arch, then the inner to the outer rows of the right arch, e.g. 2,5 4,2 means 2 teeth in the outer and 5 teeth in the inner row of the… …   Dictionary of ichthyology

  • pharyngeal tooth formula — pharyngeal tooth counts (of Cyprinidae) are presented in a formula from the outer to the inner rows of the left arch, then the inner to the outer rows of the right arch, e.g. 2,5 4,2 means 2 teeth in the outer and 5 teeth in the inner row of the… …   Dictionary of ichthyology

  • pharyngeal cartilage — pharyngeal arch cartilage one of the rods of cartilage in the mesenchyme of the pharyngeal arches of the embryo, from which the cartilaginous viscerocranium develops …   Medical dictionary

  • Pharyngeal arch — Infobox Embryology Name = Branchial arch Latin = GraySubject = 13 GrayPage = 65 Caption = Schematic of developing fetus with first, second and third arches labeled. Caption2 = Floor of pharynx of human embryo about twenty six days old. System =… …   Wikipedia

  • pharyngeal grooves — the embryonic ectodermal clefts between successive pharyngeal arches; each one is named for the pharyngeal arch just in front of it. Called also branchial g s or clefts …   Medical dictionary

  • pharyngeal apparatus — the pharyngeal arches, pouches, membranes, and grooves considered as a unit; called also branchial a …   Medical dictionary

  • 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 …   Wikipedia

  • Pharyngeal — Phar yn*ge al, n. (Anat.) A pharyngeal bone or cartilage; especially, one of the lower pharyngeals, which belong to the rudimentary fifth branchial arch in many fishes, or one of the upper pharyngeals, or pharyngobranchials, which are the dorsal… …   The Collaborative International Dictionary of English

  • pharyngeal arch — n BRANCHIAL ARCH * * * (branchial arch, visceral arch) any of the paired segmented ridges of tissue in each side of the throat of the early embryo that correspond to the gill arches of fish. Each arch contains a cartilage, a cranial nerve, and a… …   Medical dictionary

  • Pharyngeal pouch (embryology) — Infobox Embryology Name = PAGENAME Latin = GraySubject = 13 GrayPage = 65 Caption = Pattern of the branchial arches. I IV branchial arches, 1 4 branchial pouches (inside) and/or pharyngeal grooves (outside) a Tuberculum laterale b Tuberculum… …   Wikipedia

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