Questions and Answers
Most of the intersegmental arteries in the abdomen become lumbar arteries; however, the fifth pair of lumbar intersegmental arteries remains as the common iliac arteries. Formation of single aorta Initially, the paired dorsal aortae run through the entire length of the embryo. Later, the caudal portions of the paired dorsal aortae fuse to form a single lower thoracic/abdominal aorta. Of the remaining paired dorsal aortae, the right regresses and the left becomes the primordial aorta. The unpaired ventral branches of the dorsal aorta supply the umbilical vesicle, allantois, and chorion. The vitelline arteries supply the umbilical vesicle and, later, the primordial gut The paired umbilical arteries pass through the connecting stalk (primordial umbilical cord) and join the vessels in the chorion (membrane enclosing the embryo). The umbilical arteries carry poorly oxygenated fetal blood to the placenta. The proximal parts of these arteries become the internal iliac arteries and superior vesical arteries, whereas the distal parts are obliterated after birth and become medial umbilical ligaments. As the ______ arches develop during the fourth week, they are supplied by ______ arch arteries arising from the aortic sac. These arteries terminate in the dorsal aorta on the ipsilateral (same) side. As the ______ arches form during the fourth and fifth weeks, they are supplied by ______ arch arteries arising from the aortic sac and terminating in the dorsal aortae.
pharyngeal
Most of the intersegmental arteries in the abdomen become lumbar arteries; however, the fifth pair of lumbar intersegmental arteries remains as the common iliac arteries. Formation of single aorta Initially, the paired dorsal aortae run through the entire length of the embryo. Later, the caudal portions of the paired dorsal aortae fuse to form a single lower thoracic/abdominal aorta. Of the remaining paired dorsal aortae, the right regresses and the left becomes the primordial aorta. The unpaired ventral branches of the dorsal aorta supply the umbilical vesicle, allantois, and chorion. The vitelline arteries supply the umbilical vesicle and, later, the primordial gut The paired umbilical arteries pass through the connecting stalk (primordial umbilical cord) and join the vessels in the chorion (membrane enclosing the embryo). The umbilical arteries carry poorly oxygenated fetal blood to the placenta. The proximal parts of these arteries become the internal iliac arteries and superior vesical arteries, whereas the distal parts are obliterated after birth and become medial umbilical ligaments. As the ______ arches develop during the fourth week, they are supplied by ______ arch arteries arising from the aortic sac. These arteries terminate in the dorsal aorta on the ipsilateral (same) side. As the pharyngeal arches form during the fourth and fifth weeks, they are supplied by pharyngeal arch arteries arising from the aortic sac and terminating in the dorsal aortae.
pharyngeal
Most of the intersegmental arteries in the abdomen become lumbar arteries; however, the fifth pair of lumbar intersegmental arteries remains as the common iliac arteries. Formation of single aorta Initially, the paired dorsal aortae run through the entire length of the embryo. Later, the caudal portions of the paired dorsal aortae fuse to form a single lower thoracic/abdominal aorta. Of the remaining paired dorsal aortae, the right regresses and the left becomes the primordial aorta. The unpaired ventral branches of the dorsal aorta supply the umbilical vesicle, allantois, and chorion. The vitelline arteries supply the umbilical vesicle and, later, the primordial gut The paired umbilical arteries pass through the connecting stalk (primordial umbilical cord) and join the vessels in the chorion (membrane enclosing the embryo). The umbilical arteries carry poorly oxygenated fetal blood to the placenta. The proximal parts of these arteries become the internal iliac arteries and superior vesical arteries, whereas the distal parts are obliterated after birth and become medial umbilical ligaments. As the pharyngeal arches develop during the fourth week, they are supplied by ______ arch arteries arising from the aortic sac. These arteries terminate in the dorsal aorta on the ipsilateral (same) side. As the pharyngeal arches form during the fourth and fifth weeks, they are supplied by pharyngeal arch arteries arising from the aortic sac and terminating in the dorsal aortae.
pharyngeal
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