Question

Differnce between aerotic arch of brds and mammals ?

Answer 1

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The Aortic Arches (Arterial Arches)

The aortic arches (Plates 45, 46, 108–110, 119Plate 45Plate 46Plate 108Plate 109Plate 110Plate 119) are the blood vessels that supply the pharyngeal arches (Chapter 8), and they serve as a communication between the ventral and dorsal aortae. They are formed mainly from neural crest cells (Brockman et al., 1990). A splanchnic plexus forms around the foregut and gives rise to the pharyngeal arch arteries as well as the pulmonary and bronchial vessels (DeRuiter et al., 1993). The ventral aorta is the main artery into which the truncus arteriosus leads (Text-Figure 39; Plates 45, 46Plate 45Plate 46). It bifurcates into left and right vessels which extend forward as the paired external carotids,whilst the paired dorsal aortae extend forward as the internal carotids. The aortic arches do not all develop at once, and some are of a transitory nature, disappearing before others have even begun to form. They are paired, serving the left and right pharyngeal regions.