Fig. 22. Ultrastructure of one form of anomalous PVD. A. Scanning electron microscopy of specimen in Figure 21 demonstrates the appearance of the posterior surface of the tissue that was adherent to the posterior vitreous cortex. There are multiple, round protuberances. B. A higher magnification view demonstrates the appearance of one of the protuberances on the posterior aspect of the cap of tissue on the posterior vitreous. (Sebag J: Age-related differences in the human vitreoretinal interface. Arch Ophthalmol 109:966, 1991. Copyright (χ) 1991, American Medical Association) C. Transmission electron microscopy of specimen in A identified the tissue adherent to the posterior vitreous cortex as the ILL of the retina (white arrows). The round protuberances are the inner portions of Müller cells (MC) that broke away and remained adherent to the posterior aspect of the ILL. Separation of the vitreous fibrils in the vitreous cortex (black arrows) from the ILL is artifact (×21,200). (Sebag J: Age-related differences in the human vitreoretinal interface. Arch Ophthalmol 109:966, 1991. Copyright (χ) 1991, American Medical Association)