A dense, white fibrous membrane covering a bone is referred to as the :

Options

A. perichondrium
B. lamella
C. periosteum
D. endosteum

Explanation

To answer the question "A dense, white fibrous membrane covering a bone is referred to as the:", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking for the name of a specific membrane that covers the outer surface of bones.

2. **Evaluate the Options**: We need to analyze the given options to identify which one fits the description of a dense, white fibrous membrane covering a bone.

3. **Option Analysis**:
- **Option 1: Perichondrium**: This is a layer of dense irregular connective tissue that surrounds cartilage, not bone. Therefore, this option is incorrect.
- **Option 2: Lamella**: Lamella refers to thin layers or plates of tissue found in bone, but it does not cover the bone itself. Thus, this option is also incorrect.
- **Option 3: Periosteum**: The periosteum is a dense, white fibrous membrane that covers the outer surface of bones. This matches the description in the question, making it the correct option.
- **Option 4: Endosteum**: The endosteum is a vascular membrane that lines the inner surface of bony tissue and does not cover the outer surface of bones. Hence, this option is incorrect.

4. **Conclusion**: After evaluating all the options, the correct answer is **periosteum** (Option 3), as it is the dense, white fibrous membrane that covers the outer surface of bones.

### Final Answer:
The dense, white fibrous membrane covering a bone is referred to as the **periosteum**.

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