Modifications of pattern in the aortic arch system of birds and their phylogenetic significance.
Left brachial artery arising from a common innominate trunk, instead of coming off separately from the aortic arch.
The head-cavity in the arch and its situation in relation to the aortic arch.
The second arch becomes the aortic arch, the third the left exterior carotid.
It may be well to observe that in birds the one aortic arch turns to the right, while in mammals it turns to the left.
aortic arch n.
The curved portion between the ascending and descending portions of the aorta, lying behind the manubrium and giving rise to the brachiocephalic trunk, the left common carotid, and the left subclavian arteries. Also called arch of aorta.
Any of several pairs of arterial channels encircling the embryonic pharynx in the mesenchyme of the branchial arches.