ANATOMY

Detailed explanation-1: -The length of the myelin sheath along the axon is approximately 1 mm in the PNS. Between two adjacent myelin segments, there are approximately 1-m-long gaps called nodes of Ranvier (Figure 1A and E). At the nodes, the axon is exposed to the extracellular space.

Detailed explanation-2: -node of Ranvier, periodic gap in the insulating sheath (myelin) on the axon of certain neurons that serves to facilitate the rapid conduction of nerve impulses.

Detailed explanation-3: -The nodes of ranvier are the gaps between myelin sheath. These gaps (approximately 1m in length) are generated by schwann cells. Electrical impulses transfer from these nodes.

Detailed explanation-4: -The nodes of Ranvier are characterized by short (1um), specialized regions in the axonal membrane that are not insulated by myelin. Although it is bare of myelin at the node, the axon is in direct contact with the microvilli of the Schwann cells in the PNS, or with processes of astrocytes in the CNS (Figure 1).

Detailed explanation-5: -The gap between two myelin sheaths is known as the node of Ranvier.