An American text-book of physiology . The exter-nal ligament, being attached above theaxis of rotation of the hammer, pre-vents the head of this bone frommoving too far inward, and the manu-brium from being pushed too far outward. The superior ligament, owing toits oblique course, restrains the head of the hammer from moving too faroutward. The incus, umbos, or anvil-bone (Fig. 273) is shaped somewhat like a bicus-pid tooth. Its thicker portion is hollowed on the surface and is covered with cartilage for articulation with the^ ^ head of the malleus. It has two processes, a long and a short,whi
An American text-book of physiology . The exter-nal ligament, being attached above theaxis of rotation of the hammer, pre-vents the head of this bone frommoving too far inward, and the manu-brium from being pushed too far outward. The superior ligament, owing toits oblique course, restrains the head of the hammer from moving too faroutward. The incus, umbos, or anvil-bone (Fig. 273) is shaped somewhat like a bicus-pid tooth. Its thicker portion is hollowed on the surface and is covered with cartilage for articulation with the^ ^ head of the malleus. It has two processes, a long and a short,which project at right angles to Fig. 272.—Ligaments of the ossicles and their axisof rotation (from Foster, after Hensen). The figurerepresents a nearly horizontal section of the tym-panum, carried through the heads of the malleusand incus: M, malleus ; 1, incus; t, articular toothof incus; and , external ligament of mal-leus ; , ligament of the incus ; the line a-x rep-resents the axis of rotation of the two
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Keywords: ., bookautho, bookcentury1800, bookdecade1890, booksubjectphysiology
