Anomalies of the cardiac position: - PowerPoint Presentation

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Anomalies of the cardiac position:1.dextrocardia: the heart lies on the Rt side associated with or with out situs inversus (abnormal transposition of abdominal viscera).2.ectopia cordis: the heart lies on the surface of the chest.

Arterial system:Each of the pharyngeal arches has its own artery and cranial nerve. These arteries are called aortic arches that originate from the root of the aorta (the aortic sac), and end into the dorsal aorta. There are 6 pairs of aortic arches, in human embryo, the 5th arch often underdeveloped or

absent.

The first aortic arch: largely disappears, remnant of it forms the maxillary artery.The second aortic arch: also disappears, remnant of it forms the hyoidal and stapedial arteries.The third aortic arch: forms the common carotid artery and the beginning of the of the internal carotid artery

.

Continuation of the internal carotid is derived from the dorsal aorta distal to the third arch.

The forth aortic arch: forms the arch of the aorta on the left side between the Lt common carotid artery and the Lt 7th intersegmental artery (which is the primordium of the Lt subclavian artery). On the Rt side, the 4th aortic arch forms the beginning of the Rt subclavian artery

, the continuation of it is derived from the Rt dorsal aorta connecting the 4th, 5th, and 6th aortic arches and also by the 7th intersegmental artery.