Question

Choose the correct one.

• A. Optic nerve is the shortest
• B. In amniotes the last cranial nerve is spinal accessory
• C. In non-amniotes the last cranial nerve is vagus
• D. Olfactory nerves have mixed fibres

Answer 1

Answer: (C)

In non-amniotes the last cranial nerve is vagus

10 pairs of cranial nerves are present in amniotes fish and amphibian and 12 pairs occur in amniotes reptiles and mammals. In non-amniotes, the cranial nerves are Olfactory Optic, Occulomotor, Trochlear, Trigeminal, Abducen, Facial, Auditory Glossopharyngeal and Vagus.

So, option C is the correct option.