Fig. 18. Posterior girdle zonules on the pars plana in the vitreous base. A. Arrows indicate fibers passing circumferentially in vitreous base remnants (vb) on the pars plana. Ciliary processes and minor plicae are on the upper left (SEM, × 65). B. High-power view of above area, showing 1.5-μm circumferential zonular bundle (cz) among the collagen fibers of the cortical vitreous that are also oriented circumferentially. Round particles are melanin granules (SEM, × 9,000).