Which of the following is true of Neurilemma?

Options

A. Discontinuous at nodes of Ranvie
B. Continuous at nodes of Ranvier and made by schwann cells
C. Discontinuous at nodes of Ranvier and made by schwann cells
D. Continuous at nodes of Ranvier and made by oligodendrocytes

Answer

To determine which statement about Neurilemma is true, we can analyze the options provided:

1. **Understanding Neurilemma**: Neurilemma is a layer that surrounds the axons of nerve cells. It is primarily composed of Schwann cells in the peripheral nervous system.

2. **Nodes of Ranvier**: These are gaps in the myelin sheath where the axon is exposed. The myelin sheath is formed by Schwann cells in the peripheral nervous system, and the neurilemma is the outermost layer of these Schwann cells.

3. **Analyzing the Options**:
- **Option 1**: "Discontinuous at the nodes of Ranvier." This statement is true because the neurilemma does not cover the nodes of Ranvier, which are the gaps between the myelinated segments of the axon.
- **Option 2**: "Continuous at the nodes of Ranvier and made by the Schwann cells." This statement is incorrect because the neurilemma is not continuous at the nodes.
- **Option 3**: "Discontinuous at the nodes of Ranvier and made by the Schwann cells." This statement is partially correct, as it mentions the discontinuity but does not specify that the neurilemma is the outer layer of the Schwann cells.
- **Option 4**: "Continuous at the nodes of Ranvier and made by the oligodendrocytes." This statement is incorrect because oligodendrocytes are found in the central nervous system and do not produce neurilemma.

4. **Conclusion**: The correct answer is **Option 1**: "Discontinuous at the nodes of Ranvier."