). Number of aortic arches in cartilaginous fishes are:
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Answer:
There are six aortic arches in cartilaginous fishes.
Explanation:
➡️ The 1st branchial arch is innervated by the trigeminal nerve (V).
➡️ The 2nd branchial arch is innervated by the facial nerve (VII).
➡️ The 3rd branchial arch is innervated by the glossopharyngeal nerve (IX).
➡️ The 4th branchial arch is innervated by the vagus nerve (X).
➡️ The 6th branchial arch is innervated by the vagus nerve (X).
especial point to remember ⤵️
✴️✴️ In cartilaginous fish, six branchial arches develop and form the beginnings of the gills and the viscero-cranium. In mammals, there are five numbered branchial arches denoted 1, 2, 3, 4 and 6. The fifth arch does not develop. ✴️✴️.
___hope it help
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