. The elements of pathological histology with special reference to practical methods . r of the cyst, resembling connectivetissue. The connective tissue of which fibrous i^olypi are composed isbut seldom dense; usually it is oedematous, owing to interferencewith the return of the blood in consequence of compression of thetumour by the wall of the meatus. The denser polypi consist ofwavy connective tissue with scanty cells, which is arranged in denselyfibrous bands especially along the blood-vessels. In the oedematous 2 E 434 THE MIDDLE EAR polypi is seen a very delicate network of connective-t
. The elements of pathological histology with special reference to practical methods . r of the cyst, resembling connectivetissue. The connective tissue of which fibrous i^olypi are composed isbut seldom dense; usually it is oedematous, owing to interferencewith the return of the blood in consequence of compression of thetumour by the wall of the meatus. The denser polypi consist ofwavy connective tissue with scanty cells, which is arranged in denselyfibrous bands especially along the blood-vessels. In the oedematous 2 E 434 THE MIDDLE EAR polypi is seen a very delicate network of connective-tissue fibrilsrunning a wavy course, at the nodal points of which lie round,spindle-shaped, and stellate cells (Fig. 221). The cJiolcsteatomata {margaritomata, pearl-tumours) which oftenoccur as true heteroplastic tumours in the temporal bone correspondin their histological details with the desquamative products alreadydescribed (p. 429). An investing membrane connected with the bonehas been made out in them, from the rete Malpighii of which thecornifying epithelial layers are Fig. 221.—From a Fibroxts Polypus of the Tympanic Mucous Membrane, composed ofoedematous connective tissue, x 440. (Alum cochineal.) Sarcomata and carcinomata in some cases develop primarily in thetympanic cavity, in others grow into it from the neighbouring struc-tures. A psammoma has also been observed, which had penetratedinto the tympanic cavity from that of the cranium after the tegmentympani had been broken through. 10. Diseases of the Mastoid Process.—Most of the morbid condi-tions of this segment of the middle ear develop in connection withpathological processes in the tympanic cavity. In inflammatorychanges the same appearances are present in the muco-periosteallining of the air-cells as were already described in the case of thetympanic mucous membrane, with the addition only of abundantdesquamation of the flat epithelial cells. In acute inflammationswe find the air-containing lumen of
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpatholo, bookyear1895
