Fig. 15. Drawing of the ciliary body showing the layers of the ciliary muscle as seen from two perspectives—a step-wise dissection beginning from just beneath the sclera and as seen in meridional sections. The longitudinal bundle (1) is seen originating from epichoroidal stars (f) that attach the muscle to the inner surface of the sclera and continue forward to the scleral spur (d). Its tendons continue beyond into the trabecular meshwork (a). Beneath the longitudinal bundle, the bifurcating fibers (g) of the radial bundle (2) are seen, and, finally, the circular bundle (3) is evident. Schlemm's canal (b) and the external collector channels (c) are also shown. (With permission from: Hogan M, Alvarado J, and Wedell J: Ciliary body and posterior chamber. In: Histology of the Human Eye. Philadelphia: WB Saunders, 1971, p. 270.)