Peripheral nerve

These cross sections show numerous myelinated axons of various sizes, as well as unmyelinated axons. In the peripheral nervous system, the myelin sheath is produced by Schwann cells. Note how the Schwann cell nucleus and cytoplasm conforms to the outer contours of the myelin. 1000x

These cross sections show numerous myelinated axons of various sizes, as well as unmyelinated axons. In the peripheral nervous system, the myelin sheath is produced by Schwann cells. Note how the Schwann cell nucleus and cytoplasm conforms to the outer contours of the myelin. 1000x

The myelin sheath surrounds individual axons and consists of the spiral wrappings of Schwann cell plasma membranes. The uniquely high lipid content of myelin provides insulation of the axon and increases conduction velocity. The radial lines in the sheath are proteinaceous remnants of the plasma membrane. Axons and their sheaths are surrounded by the endoneurium.

The myelin sheath surrounds individual axons and consists of the spiral wrappings of Schwann cell plasma membranes. The uniquely high lipid content of myelin provides insulation of the axon and increases conduction velocity. The radial lines in the sheath are proteinaceous remnants of the plasma membrane. Axons and their sheaths are surrounded by the endoneurium.

The myelin sheath surrounds individual axons and consists of the spiral wrappings of Schwann cell plasma membranes. The uniquely high lipid content of myelin provides insulation of the axon and increases conduction velocity. The radial lines in the sheath are proteinaceous remnants of the plasma membrane. Axons and their sheaths are surrounded by the endoneurium.

The endoneurium is composed of fibroblasts and collagen fibrils interspersed between the Schwann cells and the axons they ensheath. Also present in the endoneurium are blood vessels, mast cells and macrophages.

The endoneurium is composed of fibroblasts and collagen fibrils interspersed between the Schwann cells and the axons they ensheath. Also present in the endoneurium are blood vessels, mast cells and macrophages.

The endoneurium is composed of fibroblasts and collagen fibrils interspersed between the Schwann cells and the axons they ensheath.