Midbrain of Frog consists of

Options

A. Corpora quadrigemina
B. Corpora quadrigemina and crura cerebri
C. Two optic lobes and crura cerebri
D. Two optic lobes

Answer

### Step-by-Step Solution:

1. **Identify the Components of the Midbrain**: The midbrain of a frog consists of several important structures. The primary components include the optic lobes and the crura cerebri.

2. **Understand the Function of the Optic Lobes**: The optic lobes are responsible for processing visual information. They play a crucial role in how frogs perceive their environment.

3. **Describe the Crura Cerebri**: The crura cerebri are two longitudinal bands of nerve fibers located in the midbrain. They are thickened areas found on the ventrolateral sides of the midbrain, contributing to the connection of various brain regions.

4. **Summarize the Structure of the Midbrain**: The midbrain can be described as a contracted region of the brain that includes paired structures. The dorsal thickening is divided into paired dorsolateral thickening, which are the optic lobes, and the ventrolateral thickening, which are the crura cerebri.

5. **Conclude with the Correct Answer**: Based on the components discussed, the midbrain of the frog consists of the optic lobes and crura cerebri. Therefore, the correct answer to the question is that the midbrain of a frog consists of optic lobes and crura cerebri.