Quain's elements of anatomy . Fig. 392.—Section of one of the human semicircular canals (Riidinger). Magnified. 1, osseous wall; 2, fibrous bands with included blood-vessels, united at 3 with theperiosteum; 4, memliranous canal with its three layers ; 5, short fibrons bands (withintervening spaces) uniting the membranous canal firmly to the periosteum ; 6, union ofits outermost layer with the periosteum. Fig. Fig. 393.—Section of membkanous semicircular canal, much magnified (Riidinger). 1, outer fibrous layer ; 2, tunica propria ; 3, 6, papilliform projections with epithelialcovering ;
Quain's elements of anatomy . Fig. 392.—Section of one of the human semicircular canals (Riidinger). Magnified. 1, osseous wall; 2, fibrous bands with included blood-vessels, united at 3 with theperiosteum; 4, memliranous canal with its three layers ; 5, short fibrons bands (withintervening spaces) uniting the membranous canal firmly to the periosteum ; 6, union ofits outermost layer with the periosteum. Fig. Fig. 393.—Section of membkanous semicircular canal, much magnified (Riidinger). 1, outer fibrous layer ; 2, tunica propria ; 3, 6, papilliform projections with epithelialcovering ; 5, fixed side of the canal, with very thin tunica propria without papillae ;7, fibrous bands passing to periosteum. STEUCTIJEE OF THE SEMICIECULAR CANALS. 453 onter fibrous stratum, an inner epithelial lining, and between the two atunica propria. These layers are not of equal thickness throughout, foralong the side which is in contact with and supported by the bone(fig. 392, 6), they are thinner than at the rest of the circumference,where they lie free and are bathed by the perilymph. The difference inthickness affects the fibrous layer and the tunica propria only, for theepithelium forms throughout a lining of simple flattened cells. The fibrous layer (fig. 392,1), which contains some irregular pigment-cells, is apparently composed of ordinary fibrous tissue, similar to thatof the periosteum, with which
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