. Kirkes' handbook of physiology . Fig. 443. Fig. 444. Fig. 443.—Ciliary Processes, as Seen from Behind, i, Posterior surface of the iris, with thesphincter muscle of the pupil; 2, anterior part of the choroid coat; 3, one of the ciliary processes,of which about seventy are represented. X£. Fig. 444.—Laminated Structure of the Crystalline Lens. The lamina? are split up after hard-ening in alcohol. 1, The denser central part or nucleus: 2, the successive external layers. X4.(Arnold.) processes, extending over the lens, is the iris. It is a sheet of connective tissueand muscle lined with epithel
. Kirkes' handbook of physiology . Fig. 443. Fig. 444. Fig. 443.—Ciliary Processes, as Seen from Behind, i, Posterior surface of the iris, with thesphincter muscle of the pupil; 2, anterior part of the choroid coat; 3, one of the ciliary processes,of which about seventy are represented. X£. Fig. 444.—Laminated Structure of the Crystalline Lens. The lamina? are split up after hard-ening in alcohol. 1, The denser central part or nucleus: 2, the successive external layers. X4.(Arnold.) processes, extending over the lens, is the iris. It is a sheet of connective tissueand muscle lined with epithelium and highly pigmented. In the middle anterior portion is a round aperture, the pupil. The mus-cle fibers are arranged circularly and radially and are of the unstriated muscletype. Contractions of the circular muscles of the iris produce constrictionof the pupil, while contractions of the radial fibers produce dilatation. Boththe ciliary apparatus and the iris are supplied with motor nerves. Fibers of the third cranial nerv
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