. Elements of histology. Histology. 302 Elements of Histology. [Chap, xxxvu. â H.'iii'S' 1" ' ' i '.'" '. 1'' iris: these are the bundles of the dilatator pupillaz, forming a sort of thin membrane near the posterior surface of the iris (Henle and others). At the ciliary margin the bundles take a circular direction, and form a plexus (Ivanoff). 422. The blood-vessels (Fig. 153) of the iris are very numerous. The arteries are derived from the circulus arteriosus iridis major, situated at the ciliary margin of the iris, and from the arteries of the ciliary processes. These arte
. Elements of histology. Histology. 302 Elements of Histology. [Chap, xxxvu. â H.'iii'S' 1" ' ' i '.'" '. 1'' iris: these are the bundles of the dilatator pupillaz, forming a sort of thin membrane near the posterior surface of the iris (Henle and others). At the ciliary margin the bundles take a circular direction, and form a plexus (Ivanoff). 422. The blood-vessels (Fig. 153) of the iris are very numerous. The arteries are derived from the circulus arteriosus iridis major, situated at the ciliary margin of the iris, and from the arteries of the ciliary processes. These arteries run in a radiating direction towards the pupillary margin, where they terminate in a dense network of capillaries for the sphincter pupillse. But there are also numerous capil- lary blood-vessels of a more or less longitudinal direction near the posterior surface of the iris. The veins accompany the arte- ries, and both are situated in the middle stratum of the substantia propria. In the sheath of the blood- vessels are lymph clefts and lymph sinuses ; there appear to be no other lymphatics. 423. The nerve - fibres are very numerous (Arnold, Formad), and in the outer or ciliary portion of the iris form a rich plexus, from which are derived, (a) networks of non-medullated fibres for the dilator pupillse; (b) a network of fine. Fig. 153. â Blood-vessels (injected) of the Iris and Choroid Membrane of the Eye of a Child. «, Capillaries of the choroid; b, ora serrata; c, blood- vessels derived from d, those of the ciliary pro- cesses, and from e, those of the iris ; /, capillary net- work of the pupillary bor- der. (KOlliker, after Arnolds. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Klein, E. (Edward), 1844-1925. Philadelphia : H. C. Lea's Son
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