Aortic arches

Aortic arches

Infobox Embryology
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Caption = Scheme of the aortic arches and their destination.


Caption2 = Profile view of a human embryo estimated at twenty or twenty-one days old.
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DorlandsPre = a_57
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:"This article focuses upon the multiple aortic arches present in the embryo. For the single structure present in the adult, see Aortic arch"

The aortic arches are a series of six paired embryological vascular structures which give rise to several major arteries. They are ventral to the dorsal aorta.

pecific arches

Arches 1 and 2

The "first" and "second arches" disappear early, but the dorsal end of the second gives origin to the stapedial artery, a vessel which atrophies in humans but persists in some mammals. It passes through the ring of the stapes and divides into supraorbital, infraorbital, and mandibular branches which follow the three divisions of the trigeminal nerve. The infraorbital and mandibular arise from a common stem, the terminal part of which anastomoses with the external carotid.

On the obliteration of the stapedial artery this anastomosis enlarges and forms the internal maxillary artery, and the branches of the stapedial artery are now branches of this vessel.

The common stem of the infraorbital and mandibular branches passes between the two roots of the auriculotemporal nerve and becomes the middle meningeal artery; the original supraorbital branch of the stapedial is represented by the orbital twigs of the middle meningeal.

Arch 3

The "third aortic arch" constitutes the commencement of the internal carotid artery, and is therefore named the carotid arch.

Arch 4

The "fourth right arch" forms the right subclavian as far as the origin of its internal mammary branch; while the fourth left arch constitutes the arch of the aorta between the origin of the left carotid artery and the termination of the ductus arteriosus.

Arch 5

The "fifth arch" disappears on both sides.

Arch 6

The "sixth right arch" disappears; the "sixth left arch" gives off the pulmonary arteries and forms the ductus arteriosus; this duct remains pervious during the whole of fetal life, but is obliterated a few days after birth.

His showed that in the early embryo the right and left arches each gives a branch to the lungs, but that later both pulmonary arteries take origin from the left arch.


=Additional

ee Also

*Pharyngeal arches

External links

*
* [http://www-personal.umich.edu/~dsaddawi/med2008/resources/aortic%20arches.jpgDiagram] at University of Michigan
*


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