A non- medullated nerve fibre does not have

Options

A. schwann cells
B. neurilemma
C. nissl's granules
D. nodes of ranvier

Answer

### Step-by-Step Solution

1. **Understanding Nerve Fibers**:
- Nerve fibers, also known as axons, are the long projections of neurons that transmit electrical impulses.

2. **Definition of Non-medullated Nerve Fibers**:
- Non-medullated nerve fibers, also referred to as non-myelinated nerve fibers, lack a myelin sheath. This is a crucial characteristic that differentiates them from medullated (myelinated) nerve fibers.

3. **Analyzing the Options**:
- **Option 1: Sequent Cells**: These are supportive cells found near axons in the peripheral nervous system. They are present in both myelinated and non-myelinated fibers, so this option is incorrect.
- **Option 2: Neurolemma**: This is the outermost layer that surrounds both myelinated and non-myelinated nerve fibers. Since non-medullated fibers have neurolemma, this option is also incorrect.
- **Option 3: Nissl's Granules**: These are found in the cytoplasm of the neuron’s cell body and are involved in protein synthesis. They are present in both types of nerve fibers, making this option incorrect as well.
- **Option 4: Nodes of Ranvier**: These are gaps in the myelin sheath of medullated fibers that facilitate rapid signal transmission. Since non-medullated fibers do not have a myelin sheath, they do not have Nodes of Ranvier.

4. **Conclusion**:
- The correct answer is that a non-medullated nerve fiber does not have **Nodes of Ranvier**.