. Elementary physiology . Fig. 117.—Profile view of the left membrana tympani and auditory ossicles from before and somewhat from above. Magnified four times- (E. A. S.) The anterior half of the membrane has been cut away by an oblique slice, m, head of the malleus ; sp, spur-like projection of the lower border of its articular surface ; pr. br, its short process ; pr. gr, root of processus gracilis, cut; , suspensory ligament of the malleus ; , its external ligament ; , tendon of the tensor tympani, cut; i, incus, its long process; st, stapes in fenestra ovalis ; , e
. Elementary physiology . Fig. 117.—Profile view of the left membrana tympani and auditory ossicles from before and somewhat from above. Magnified four times- (E. A. S.) The anterior half of the membrane has been cut away by an oblique slice, m, head of the malleus ; sp, spur-like projection of the lower border of its articular surface ; pr. br, its short process ; pr. gr, root of processus gracilis, cut; , suspensory ligament of the malleus ; , its external ligament ; , tendon of the tensor tympani, cut; i, incus, its long process; st, stapes in fenestra ovalis ; , external auditory meatus ; p-R. notch of Rivinus ; , membrana tympani ; u, its most depressed point or umbo ; d, declivity at the extremity of the external meatus ; , internal auditory meatus ; a and b^ its upper and lower divisions for the corresponding parts of the auditory nerve ; ;, canal for the nerve to the ampulla of the posterior semicircular canal; , ampullary end of the superior canal ; /, ampullary opening of the posterior cannl ; c, common aperture of the superior and posterior canals ; , ampullary, and e'., non-ampullary end of the external canal ; , scala tympani cochleae ; , fenestra rotunda, closed by its membrane ; a. F, aqueduct of Fallopius. labyrinth (see Fig. 119). Within the bony labyrinth lies a membranous tube of corresponding shape called the membranous labyrinth (see Fig. 118), which does not entirely fill the cavity in the bone, but leaves a space which is filled with a fluid called the perilymph. The mernbranous labyrinth is likewise filled with fluid, which is termed the endolymph. The parts of the membranous labyrinth (see Fig. 118) are
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