. Pathology and bacteriology [electronic resource]. Ophthalmology; Eye; Eye; Bacteriology; Ophthalmology; Eye; Bacteriology; Eye. MECHANISM FOR MAINTENANCE OF INTRAOCULAR TENSION 297 into the vortex veins. Under normal conditions, therefore, the veins of the iris also act as channels of excretion. The particles of pigment or Indian ink are carried into the canal of Schlemm by phagocytes, in their passage through the pectinate ligament, a certain amount of pig- ment is expressed from the phagocytes and remains behind in its Fig. 156.—Shows a bleached section of the ciliary body in whic
. Pathology and bacteriology [electronic resource]. Ophthalmology; Eye; Eye; Bacteriology; Ophthalmology; Eye; Bacteriology; Eye. MECHANISM FOR MAINTENANCE OF INTRAOCULAR TENSION 297 into the vortex veins. Under normal conditions, therefore, the veins of the iris also act as channels of excretion. The particles of pigment or Indian ink are carried into the canal of Schlemm by phagocytes, in their passage through the pectinate ligament, a certain amount of pig- ment is expressed from the phagocytes and remains behind in its Fig. 156.—Shows a bleached section of the ciliary body in which some of the downgrowths from the pigment epithelial layer have been cut transversely. These transverse sections are seen to have a central lumen, so that the down growths are evidently tubular in character, and presumably glandular. The canal of Schlemm unlike other veins is always found patent in sections of the eye, and under normal conditions never contains blood. It is held open by its fibrous tissue surroundings, and so kept from collapsing like the central retinal vein on the optic disc, when the intraocular pressure is increased at each systole of the heart. The escape of fluid into the canal of Schlemm is further aided by the pump-like action of the ciliary muscle, ^ which on contraction pulls back the scleral spur at the angle of the anterior chamber, so increasing the size of its lumen, and sucking fluid into it from the anterior chamber. Experimentally it has been shown, in the eyes of various animals and of man, that Indian ink injected into the ^ Arthur Thomson. The Ophthalmoscope, IX, 1911, 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 Collins, E. Treacher (Edward Treacher), 1862-1937; Mayou, M. Stephen (Marmaduke Stephen), 1876-1934; Pyle, Walter L. (Walter Lytle), 1871-1921, edito
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