. A compend of human physiology; especially adapted for the use of medical students. Physiology. THE SENSE OF HEARING. 239 process of the incus, and internally, by its oval base, with the edges of the foramen ovale. The tensor tympani muscle consists of a fleshy, tapering portion, % of an inch in length, which terminates in a slender tendon ; it arises from the cartilaginous portion of the Eustachian tube and the adjacent surface of the sphenoid bone. From this origin the muscle passes nearly horizontally. Fig. 34.—Tympanum and Auditory Ossicles (Left) Magnified. External meatus. M. Membr
. A compend of human physiology; especially adapted for the use of medical students. Physiology. THE SENSE OF HEARING. 239 process of the incus, and internally, by its oval base, with the edges of the foramen ovale. The tensor tympani muscle consists of a fleshy, tapering portion, % of an inch in length, which terminates in a slender tendon ; it arises from the cartilaginous portion of the Eustachian tube and the adjacent surface of the sphenoid bone. From this origin the muscle passes nearly horizontally. Fig. 34.—Tympanum and Auditory Ossicles (Left) Magnified. External meatus. M. Membrana tympani, which is attached to the handle of the malleus, n, and near it the short process, p. h. Head of the malleus, a. Incus; K, its short process, with its ligament; 1, long process, s. Sylvian ossicle. S. Stapes. Ax, Ax, is the axis of rotation of the ossicles; it is shown in perspective, and must be imagined to penetrate the plane of the paper, t. Line of traction of the tensor tympani. The other arrows indicate the movement of the ossicles when the tensor contracts. backward to the tympanic cavity ; just opposite to the" fenestra ovalis its tendon bends at a right angle over the processus cochleariformis, and then passes outward across the cavity, to be inserted into the angle of the mal- leus near the neck. The stapedius muscle emerges from the cavity of a pyramid of bone projecting from the posterior wall of the tympanum ; the tendon passes. 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 Brubaker, Albert P. (Albert Philson), 1852-1943. Philadelphia, Blakiston
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