Functional groups are defined as specific groupings of atoms or bonds which are part of a larger hydrocarbon chain. It is necessary that you are able to recognize these groups by structure and by name. The ending of the name as a suffix tells the type of compound or functional group present.
[TA] a slight constriction of the aorta immediately distal to the left subclavian artery at the point of attachment of the ductus arteriosus. Synonym(s): isthmus aortae [TA], isthmus of aorta. A constriction in the fetal aorta between the ductus arteriosus and the left subclavian artery.
For the embryological structure, see Aortic arches. The aortic arch, arch of the aorta or the transverse aortic arch (English pronunciation: /eÉªËÉrtÉªk/) is the part of the aorta between the ascending and descending aorta. The arch travels backward, so that it ultimately runs to the left of the trachea.t this point the aortic arch continues as the descending aorta. The aortic arch has three branches. The first, and largest, branch of the arch of the aorta is the brachiocephalic trunk, which is to the right and slightly anterior to the other two branches and originates behind the manubrium of the sternum.