Question

Compare tha aortic arches of amphibia and birds​

Answer 1

In birds it is the right aortic arch (IV) that gives rise to the systemic arch while in mammals it is the left arch. In birds, the blood vessels to the forelimb arise from the anterior arteries supplying the head.

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Answer 2

Answer:

Explanation: AMPHIBIANS=In amphibians the aortic arches retain the bilateral symmetry. Of the six

pairs of embryonic aortic arches, the fifth one is observed in adult

Cryptobranchus (Urodele). The sixth arch becomes small. It gives rise to the

pul¬monary artery and continues as the ductusarteriosus to the dorsal

stem. The pulmonary artery may give rise to musculocutaneous artery.

In Necturus , the first external gill is supplied by the third afferent arch. The

base of the sixth arch is absent in Necturus. The ductusarteriosus connects

pul¬monary artery with the dorsal stem.

The radix between arches 3rd and 4th on each side gradually disappear.

The anterior continuation of ventral aorta becomes the external carotid

arteries . The 3rd arch together with the anterior portion of the radix of the

aorta on that side becomes the internal carotid arteries.

In anurans (adult), only three pairs of aortic arches (III, IV and VI) are

present. But in the tadpole the development of aortic arches cor¬respond

to the emergence of external and internal gills

BIRDS=The birds retain three pairs of aortic arches. These are lllrd, IVth and VIth.

Rest three pairs such as 1st , 2nd , and 5th are lost.

The third becomes carotid artery, the fourth becomes systemic aorta but

retains only the systemic arch on the right side.

The ductuscaroticus disappears.

The systemic arch on the left side disappears. The right systemic arch

originates from the systemic aorta that develops from left ventricle. The  

sixth arch becomes the pulmonary aorta that divides into two pulmonary

arteries and each artery goes to each lung

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