Peripheral nerve
One Schwann cell forms a segment, called an internode, of a myelin sheath around a portion of an axon. The myelin sheath is formed by continuous, multiple wrappings of a Schwann cell plasma membrane, producing a lipid-rich insulation that increases conduction speed of nerve impulses. The space between adjacent internodes is the node of Ranvier. 15,000x
Axon
One Schwann cell forms a segment, called an internode, of a myelin sheath around a portion of an axon. The myelin sheath is formed by continuous, multiple wrappings of a Schwann cell plasma membrane, producing a lipid-rich insulation that increases conduction speed of nerve impulses. The space between adjacent internodes is the node of Ranvier. 15,000x
Myelin sheath
One Schwann cell forms a segment, called an internode, of a myelin sheath around a portion of an axon. The myelin sheath is formed by continuous, multiple wrappings of a Schwann cell plasma membrane, producing a lipid-rich insulation that increases conduction speed of nerve impulses. The space between adjacent internodes is the node of Ranvier. 15,000x
Schwann cell nucleus
One Schwann cell forms a segment, called an internode, of a myelin sheath around a portion of an axon. The myelin sheath is formed by continuous, multiple wrappings of a Schwann cell plasma membrane, producing a lipid-rich insulation that increases conduction speed of nerve impulses. The space between adjacent internodes is the node of Ranvier. 15,000x
External lamina >
The external lamina is secreted by the Schwann cell and is similar in structure and composition to the basal lamina in epithelial tissues. The external lamina provides anchorage for the Schwann cell, particularly during the myelination process. The endoneurium is product of fibroblasts in the peripheral nerve and contains collagen fibrils.
Endoneurium
The external lamina is secreted by the Schwann cell and is similar in structure and composition to the basal lamina in epithelial tissues. The external lamina provides anchorage for the Schwann cell, particularly during the myelination process. The endoneurium is product of fibroblasts in the peripheral nerve and contains collagen fibrils.
Unmyelinated axons
The external lamina is secreted by the Schwann cell and is similar in structure and composition to the basal lamina in epithelial tissues. The external lamina provides anchorage for the Schwann cell, particularly during the myelination process. The endoneurium is product of fibroblasts in the peripheral nerve and contains collagen fibrils.
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