A practical treatise on the diseases of the ear including the anatomy of the organ . show tJie openings of the upperethmoidal cells. F. S. Frontal sinus. S. S. Sphenoidal sinus. 1. Openings of tin towerethmoidal cells. 2. Probe entering into the middle nasal space from-the frontal sinus. opening between the antrum of the upper jaw and the nasal cavity. 4. Occa-sional opening between the sameparts. 5. Pharyngeal orifice of the Eustachian tube. The lateral wall of the tube, which, with its upper border,bounds the convex surface of the enveloping ridge of the car- 212 EUSTACHIAN TUBE.
A practical treatise on the diseases of the ear including the anatomy of the organ . show tJie openings of the upperethmoidal cells. F. S. Frontal sinus. S. S. Sphenoidal sinus. 1. Openings of tin towerethmoidal cells. 2. Probe entering into the middle nasal space from-the frontal sinus. opening between the antrum of the upper jaw and the nasal cavity. 4. Occa-sional opening between the sameparts. 5. Pharyngeal orifice of the Eustachian tube. The lateral wall of the tube, which, with its upper border,bounds the convex surface of the enveloping ridge of the car- 212 EUSTACHIAN TUBE. tilage, lias about the same thickness as the median wall, andthe same covering of mucous membrane. The tissue in theupper half is quite firm, in the lower more relaxed and is its chief structure. A portion of the tendinous origin of the spheno-staphyli-nus muscle unites with the firmer portion of the wall, and forsome distance this origin runs in a thin layer between theupper border of the soft wall of the tube, and unites with theconvex surface of the latter. Pig. Transverse Section of Eustachian Tube and Surrounding Parts. After Median cartilaginous plate. 2. Lateral cartilaginous hook. 3. Dilator of the tube. 4. Lavator of the soft palate. 5. Basilar fibro-cartilage. 6 and t. Acinous glands. 8. Fat inthe lateral ivall. 9. Safety tube. 10. Accessory fissure. 11. Fold ofmucous membrane,12. Adjacent tissues. The spheno-staphylinus muscle being thus attached to thetube has the power of rolling over the upper inverted borderof the cartilage, and of enlarging the angle which the lateralwall forms with the median. The opening or gaping of the tube depends upon thisaction, which occurs with the act of swallowing. EUSTACHIAN TUBE. 213 At the point where the lateral wall of the nasal cavitypasses into the pharynx, at the same height with the posteriorpoint of the inferior turbinated bone, lies the pharyngeal ori-fice of the tube. (Fig. 52.) Since the inner
Size: 1586px × 1576px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdeca, booksubjectear, booksubjecteardiseases
