Small, solid and four optic lobes or colliculus called corpora quadrigemina are found in :

Options

A. Mammals
B. Amphibians
C. Aves
D. Reptiles

Answer

To answer the question regarding where small, solid, and four optic lobes, known as corpora quadrigemina, are found, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Corpora Quadrigemina**:
- The corpora quadrigemina consists of four solid lobes that are located on the dorsal side of the brain. These lobes are responsible for processing visual and auditory information.

2. **Identifying the Location**:
- The corpora quadrigemina is situated on the dorsal side of the cerebral aqueduct. It is composed of two pairs of colliculi: the superior colliculi (upper pair) and the inferior colliculi (lower pair).

3. **Function of Corpora Quadrigemina**:
- These lobes play a crucial role in the decussation (crossing over) of many fibers of the optic nerve, which is important for visual processing.

4. **Comparing Across Species**:
- In different animal groups, the structure and function of the corpora quadrigemina can vary. For instance, in fish and amphibians, a similar structure called corpora bigemina is present, which consists of two lobes instead of four.

5. **Determining the Correct Answer**:
- The question asks where the corpora quadrigemina is found among the options provided: mammals, amphibians, apes, or reptiles. Based on the information, we conclude that the corpora quadrigemina, with its four lobes, is found in mammals.

### Final Answer:
The small, solid, and four optic lobes known as corpora quadrigemina are found in **mammals**.