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Nerve. This is a cross section of a nerve fascicle. The image on the right is an enlargement of the area in red on the left image. Axons (blue arrow) are surrounded by myelin sheaths (red arrow) which contain a large amount of lipids that dissolve out during the preparation of the tissue. The green arrow is pointing to a nucleus of a Schwann cell. The outer plasmalemma of the Schwann cell is referred to as the neurolemma (black arrow).