Figure 6

Characteristics of the membranous coating on the corrugation surfaces. A, Membranous material (MM & arrowed) covers the whole surface of the corrugations, and is also evident free in the lumen. B, Membranous material trapped between two adjacent corrugations, the alternating black and white stacks giving a tramline appearance. C, Layers of membranous material peeling off the surface of two adjacent corrugation surfaces to form the free aggregates in the lumen. D, High magnification of a free membranous stack showing the self-adherent properties of the constituents that produce myelin-like figures in the anterior lumen. E, A diagrammatic interpretation of the way in which the shed membranous layers combine to form an alternating pattern of black and white units. Scale bar: A 200 nm; B 200 nm; C 200 nm; D 200 nm; E 200 nm.