Dorsal view of the heart and afferent branchial arteries of Squalus

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1.  First Afferent Branchial Artery 2.  Second Afferent Branchial Artery 3.  Third Afferent Branchial Artery
4.  Fourth Afferent Branchial Artery 5.  Ventral Aorta 6.  Fifth Afferent Branchial Artery
7.  Ventricle 8.  Atrium 9.  Sinu Venosus