Nodes of Ranvier are gaps in the myelin sheath that surrounds the axons of neurons in the peripheral nervous system (PNS). These nodes play a crucial role in the conduction of nerve impulses along the axon.

Nodes of Ranvier possess neurilemma.

- Neurilemma: The neurilemma is the outermost layer of the myelin sheath that surrounds the axon. It is formed by the Schwann cells in the PNS. The presence of the neurilemma at the nodes of Ranvier allows for rapid and efficient conduction of nerve impulses.

- Function of the Neurilemma: The neurilemma plays a vital role in the regeneration of damaged or injured axons in the PNS. It provides a pathway for the regrowth of axons and facilitates the repair process.

- Importance of Nodes of Ranvier: The nodes of Ranvier are crucial for the saltatory conduction of nerve impulses along the axon. Saltatory conduction is a process in which the nerve impulses jump from one node to the next, allowing for faster and more efficient transmission of the signal. The presence of the nodes of Ranvier allows for the depolarization and repolarization of the axon membrane, which facilitates the conduction of the nerve impulse.

- Role in Nerve Impulse Conduction: The myelin sheath acts as an insulator, preventing the leakage of ions and increasing the speed of conduction. However, for efficient transmission of the nerve impulse, the depolarization and repolarization of the axon membrane need to occur at regular intervals. This is achieved at the nodes of Ranvier, where the axon is exposed. The depolarization occurs at one node, and the nerve impulse jumps to the next node, where repolarization occurs. This process continues along the axon, resulting in the rapid and efficient conduction of the nerve impulse.

In conclusion, nodes of Ranvier possess neurilemma, which is important for the saltatory conduction of nerve impulses along the myelinated neurons in the PNS.