Fig. 31. Bruch's membrane in the ciliary body. A. In mid pars plana, Bruch's elastica is a dotted thin line (e), appearing continuous with vein walls. n, zonular bundles. (Toluidine blue, X 400) B. The dotted line is a network of small elastic fibers with homogeneous elastin cores (e), outside the fenestrated capillary wall. (Alcian blue, X 24,500) C. Elastica becomes thicker and more complete (arrow) further posteriorly in pars plana. Note nerve bundles (nv) and ciliary muscle bundles (cm) in stroma. (Toluidine blue, X 433) D. Elastica continues smoothly from end of pars plana (left arrow) into peripheral choroid (right arrow). (Toluidine blue, X 433)