NEET2001ZoologyNeural Control and CoordinationActual
Identify the correct statement.
Options
- AIn amniotes last nerve is spinal accessory.
- BIn non-amniotes last nerve is vagus.
- COptic is shortest nerve.
- DOlfactory nerves has mixed fibres.
Correct answer
B. In non-amniotes last nerve is vagus.
Step-by-step solution
10 pairs of cranial nerves are present in anamniotes (fishes and amphibians) and 12 pairs occur in amniotes (reptiles, birds and mammals). In anamniotes the cranial nerves are - Olfactory, Optic, Occulomotor, Trochlear, Trigeminal, Abducens, Facial, Auditory, Glossopharyngeal and Vagus. In amniotes two more cranial nerves, Spinal accessory and Hypoglossal nerves are present in addition to the above ten.