A practical treatise on the diseases of the ear including the anatomy of the organ . Transverse Section the Upper Part of the Eustachian Tube. After Eenle. * Fibres of tlie spheno-staphylinus muscle. The shape of the anterior extremity of the osseous tube isvery irregular, the inner wall extending forward much furtherthan the lateral wall. This part, the isthmus, is thenarrowest portion of the tube. Here the tube graduallywidens, and ends anteriorly in a trumpet-shaped orifice and 5mm. broad, which projects slightly into the post-14 210 EUSTACHIAN TUBE. nasal space, and lies a little
A practical treatise on the diseases of the ear including the anatomy of the organ . Transverse Section the Upper Part of the Eustachian Tube. After Eenle. * Fibres of tlie spheno-staphylinus muscle. The shape of the anterior extremity of the osseous tube isvery irregular, the inner wall extending forward much furtherthan the lateral wall. This part, the isthmus, is thenarrowest portion of the tube. Here the tube graduallywidens, and ends anteriorly in a trumpet-shaped orifice and 5mm. broad, which projects slightly into the post-14 210 EUSTACHIAN TUBE. nasal space, and lies a little above the level of the floor of thenostril. The cartilage of the tube is made up of two plates—a me-dian and a lateral. The median plate, which is much thelarger, is triangular, and into its upper and outer part isinserted the hook-shaped and smaller lateral cartilage. Butmost of the lateral wall and all of the lower is formed ofmembrane instead of cartilage, the membrane forming nearlya half of the circumference of the
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Keywords: ., bookcentury1800, bookdeca, booksubjectear, booksubjecteardiseases
