Non-Experimental Aural Pathology in Squirrel Monkeys (Saimiri Sciureus) And Marmosets

Abstract

In the marmoset, with the clusters of mastoid and apical pneumatic cells in wide communication to the central tympanic space, an undivided cavity is created. Simultaneous involvement of the entire area by infectious processes is bolstered by the lack of walling-off partitions. The tegmen is everywhere readily and frequently penetrated. From the apical cell group the spheno-occipital synchondrosis was predominantly seen invaded: with the consequence of an osteomyelitis of the cranial base. Frequency of otitis media, advancing to lethal endocranial complications, is, in its portent, equivalent to other generally listed causes of death, as: pulmonary, intestinal, parasitic ones. The inner ear is surrounded by pneumatic cells. In spite of being suspended in a similarly exposed situation it is less prone to react to infections. Suppurative processes of the middle ear when reaching the inner ear are mostly “toned down” to a sero-fibrinous one. The otic capsule was never seen penetrated by suppuration. Anatomical arrangement around cochlea and vestibulum results in their ready accessibility from all directions: a circumstance of considerable advantage in experimental work on the inner car.