Mammalian pinna is supported by

Options

A. Hyaline cartilage
B. Calcified cartilage
C. Elastic cartilage
D. White fibrous connective tissue

Answer

**Step-by-Step Solution:**

1. **Understanding the Pinna**: The mammalian pinna refers to the external part of the ear. It plays a crucial role in collecting sound waves and directing them into the ear canal.

2. **Composition of the Pinna**: The pinna is primarily made up of a specific type of cartilage. In this case, it is composed of yellow elastic cartilage, which is flexible and resilient.

3. **Structure of the Pinna**: The yellow elastic cartilage forms a thin plate that gives the pinna its shape and structure. This cartilage is covered by integument (skin) and is connected to surrounding tissues by ligaments and muscles.

4. **Evaluating the Options**:
- **Option A: Hyaline Cartilage**: This type of cartilage is found in places such as joint surfaces, ribs, nose, and trachea, but not in the pinna. Therefore, this option is incorrect.
- **Option B: Calcified Cartilage**: This type of cartilage is located between hyaline cartilage and subchondral bone, which is not related to the structure of the pinna. Thus, this option is also incorrect.
- **Option C: Elastic Cartilage**: This is the correct type of cartilage that supports the mammalian pinna, providing flexibility and shape.
- **Option D: White Fibrous Connective Tissue**: This tissue is primarily found in tendons and ligaments, not in the structure of the pinna. Hence, this option is incorrect.

5. **Conclusion**: After evaluating all options, the correct answer is that the mammalian pinna is supported by **elastic cartilage**.

**Final Answer**: The mammalian pinna is supported by elastic cartilage.

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