At 21–23 days, the heart tube is connected to which structures at the cephalic and caudal ends, respectively?

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Multiple Choice

At 21–23 days, the heart tube is connected to which structures at the cephalic and caudal ends, respectively?

Early in development, the heart starts as a simple tube. Its cranial (cephalic) end is threaded into the arterial system via the pharyngeal arch arteries, which form the primitive aortic arches that connect to the dorsal aorta. The caudal (tail) end, on the other hand, drains into the sinus venosus, the venous reservoir that brings in blood from the yolk sac and, later, from the embryo itself. So at about 21–23 days, the heart tube is connected at the head end to the pharyngeal arch arteries and at the tail end to the sinus venosus.

Early in development, the heart starts as a simple tube. Its cranial (cephalic) end is threaded into the arterial system via the pharyngeal arch arteries, which form the primitive aortic arches that connect to the dorsal aorta. The caudal (tail) end, on the other hand, drains into the sinus venosus, the venous reservoir that brings in blood from the yolk sac and, later, from the embryo itself. So at about 21–23 days, the heart tube is connected at the head end to the pharyngeal arch arteries and at the tail end to the sinus venosus.

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