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VBSC 421 Final Exam- Circulatory 2.
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VBSC 421 Final Exam- Circulatory 2.
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VBSC 421 Final Exam- Circulatory 2aortic arches - ANS-vascular branches of the aorta and the branchial arches/gills
through which they run; paired
primitive structures, present during development
lampreys (8); hagfish (15); sharks (10-12); vertebrates (6)
afferent - ANS-carries blood to the gills
efferent - ANS-carries blood away from the gills
collecting loops - ANS-capillary beds between afferent and efferent arteries; joined to
efferent artery
chondrichthes - ANS-1st pharyngeal slit is reduced, forming a spiracle; arches 2-6
supply gills (5 arches persist); carotids split before the gills (paired)
teleost (actinopterygian) - ANS-arches 3-6 come off of the aorta (4 arches persist);
supply 5 pharyngeal slits
amphibians - ANS-common carotid artery develops from section of ventral aorta
between 3-4; arches 4-5 form major systemic vessels that branch off dorsal aorta; arch
6 forms pulmonary artery and ductus arteriosus
ductus arteriosus - ANS-embryonic vessel that connects the pulmonary artery and the
aorta in amniotes; bypasses blood, avoiding the lungs
lungless amphibians - ANS-pulmonary AA supplies neck and back
frogs - ANS-tadpoles have internal gill arches 3-6
metamorphosis: pulmonary artery develops from arch 6 (pulmocutaneous artery); arch 5
lost; arch 3 becomes internal carotid; arch 4 becomes major conduit to body (aortic
outflow)
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