The vascular connective tissue sheath around a fascicula is called

Options

A. Epineurium
B. Perineurium
C. Endoneurium
D. Myelin sheath

Answer

To answer the question, "The vascular connective tissue sheath around a fascicula is called," we need to analyze the options provided and understand the definitions of each term related to nerve structures.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- We need to identify the terms related to nerve sheaths: epineurium, perineurium, endoneurium, and myelin sheath.

2. **Analyzing the Options**:
- **Epineurium**: This is the outermost layer of connective tissue that surrounds the entire peripheral nerve, including multiple fascicles and blood vessels.
- **Perineurium**: This is the layer that surrounds each fascicle of nerve fibers. It is a multi-layered structure derived from fibroblasts.
- **Endoneurium**: This is a delicate layer of connective tissue that surrounds individual nerve fibers (axons) within a fascicle.
- **Myelin Sheath**: This is not a connective tissue sheath but rather an insulating layer around the axon of myelinated nerve fibers.

3. **Identifying the Correct Answer**:
- The question specifically asks for the vascular connective tissue sheath around a fascicle. The perineurium is the layer that surrounds a fascicle, making it the correct answer.

4. **Final Answer**:
- The vascular connective tissue sheath around a fascicula is called **Perineurium**.