Q170 / 180 · AIIMS 2001 · Zoology

Identify the correct statement.

  • A
    In amniotes last nerve is spinal accessory.
  • Correct answer
    B
    In non-amniotes last nerve is vagus.
  • C
    Optic is shortest nerve.
  • D
    Olfactory nerves has mixed fibres.

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.

Hence, the correct answer is option: 'B'.

More Neural Control and Coordination Questions