Question

Which following is of the false about the nervous system of frog?

• A. Forebrain includes paired olfactory lobes, paired cerebral hemispheres and unpaired diencephalon.
• B. Mid-brain comprises paired optic lobes and paired cruca crerbri.
• C. Hind-brain comprises cerebellum and medulla oblongata.
• D. There are 9 pairs of spinal nerves.

Answer 1

The correct option is D There are 9 pairs of spinal nerves.

1. The forebrain is the largest part of the brain consisting of a pair of anteriorly directed olfactory lobes, a pair of cerebral hemispheres, and a diencephalon.

2. Midbrain is well developed consisting of two dorso-lateral large rounded optic lobes. Below the optic lobes are present two thick longitudinal bands of nerve fibres, called the crura cerebri. These connect diencephalon and medulla.

3. It consists of the cerebellum and the medulla oblongata. Its function is probably to regulate the vestibule-oculomotor system controlling movements of the eyes.

4. In the frog, there are 10 pairs of spinal nerves.

So, the correct option is 'There are 9 pairs of spinal nerves'.