A Text-book of the diseases of the ear and adjacent organs / by Dr. Adam Politzer ; translated and edited by James Patterson Cassells.

  • Politzer, Adam, 1835-1920.
Date:
1883
Catalogue details

Licence: Public Domain Mark

Credit: A Text-book of the diseases of the ear and adjacent organs / by Dr. Adam Politzer ; translated and edited by James Patterson Cassells. Source: Wellcome Collection.

Provider: This material has been provided by the Harvey Cushing/John Hay Whitney Medical Library at Yale University, through the Medical Heritage Library. The original may be consulted at the Harvey Cushing/John Hay Whitney Medical Library at Yale University.

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    tympanic cavity, is closely united with the circular fibrous layer, and consists of a very scanty stratum of connective tissue with a covering of non-ciliated pavement epithelium. Gerlach has found on the lining membrane of the membrana tympani hi not inconsiderable quantities projections, sometimes globular like the papillae of the tongue, sometimes finger-shaped like the shaggy villi of the intestine. The globular projections attain such a size, that with sufficient light they are visible to the naked eye. In the central portion they consist of ordinary, on the margin rather of homogeneous connective tissue, covered with a layer of flattened cells, and they contain one or more capillary clusters, but no demonstrable nerves. They occur in greatest numbers on the membrana tympani of the new-born Fig. 19.—Section of the Membrana Tympani in the New-born Infant. a, Epidermic layer ; b, Cutaneous layer ; c, Radiated fibrous layer, with the star-like corpuscles of the membrana tympani; d, Circular fibrous layer; e, Layer of lining- membrane. infant, and as some of them are connected with the lining mem- brane only by a stalk, Gerlach declares them to be villi of the membrana tympani. The membrana tympani possesses two vascular networks, sepa- rated by the substantia propria, and anastomosing with each other at the periphery, the outer one belonging to the connec- tive tissue of the cutis, the inner to the mucous membrane. The vascular network of the cutis comes from the arteria auriculae profunda, which sends a branch to the centre of the membrana tympani This branch lies between two venous branches, which form a plexus here and there, and descends to the umbo from the superior posterior Avail of the meatus, behind