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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 <p>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</p>

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 <p>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</p>

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 <p>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</p>

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 > <p>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.</p>

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 <p>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.</p>

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 <p>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.</p>

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.