AP PSYCHOLOGY

Detailed explanation-1: -The gap between myelin sheath are called nodes of Ranvier. (c) The myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.

Detailed explanation-2: -The term “synapse” refers to the place where the terminal branches of one neuron’s axon connect to another neuron’s dendrite.

Detailed explanation-3: -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-4: -The Nodes of Ranvier are the gaps between the myelin insulation of Schwann cells which insulate the axon of neuron. The Node of Ranvier is the 1-2 micrometre gap between the glial cells of the myelin sheath. These glial cells are called Schwann cells, and they help to electrically insulate the neuron.

Detailed explanation-5: -The nodes of Ranvier are specialized axonal segments that lack myelin, allowing the saltatory conduction of action potentials. Important progress has been made in unravelling the fine structure of the nodal environs and in understanding the formation of a node.