In a bone, concentric layers of matrix are called

Options

A. Haversian canals
B. Volkman's canals
C. lacunae
D. lamellae

Answer

To solve the question, "In a bone, concentric layers of matrix are called," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Bone**:
- Bones are made up of a hard matrix that provides strength and support. This matrix is organized in a specific way.

2. **Identify the Components of Bone**:
- In bone tissue, there are various components including osteocytes, lacunae, Haversian canals, and lamellae.

3. **Define the Terms**:
- **Haversian canals**: These are the central channels in the bone that contain blood vessels and nerves.
- **Lacunae**: Small cavities in the bone matrix that house osteocytes (bone cells).
- **Lamellae**: These are the concentric layers of bone matrix that surround the Haversian canals.

4. **Focus on the Question**:
- The question specifically asks about the concentric layers of the matrix.

5. **Select the Correct Answer**:
- Since the concentric layers of the matrix are called **lamellae**, the correct answer is **lamellae**.

### Final Answer:
The concentric layers of matrix in a bone are called **lamellae**.

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