Fig. 43. Insertion of the posterior ciliary muscle (m) in the pars plana. A. Elastic tendons are seen associated with the three central thin muscle tips. The tendons are networks of elastic fibers (el), some aggregated oxytalan fibers (arrows), infrequent small elaunin fibers (arrowhead), interconnected by diffuse elastic microfibrils. Basement membranes are interrupted where tendons attach to the cells. Stained with gold-labeled elastin antibody. (X 30,700) B. Perivascular elastica (el) showing microfibrillar interconnections adjacent to a knobby Bruch's membrane (asterisk). (X 19,600) C. Bruch's membrane cut parallel to its surface, showing excrescences with attaching elastic microfibrils (asterisks) and closely associated collagen fibrils (arrows). A-C, at age 17.