The anatomy of the human lung / by A.T. Houghton Waters.

  • Waters, A. T. H. (Alderman Thomas Houghton), 1826-1912.
Date:
1860
Catalogue details

Licence: Public Domain Mark

Credit: The anatomy of the human lung / by A.T. Houghton Waters. Source: Wellcome Collection.

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    and the continuation of tlie tubs connects tlie carti- lages with one another. Perichondrium. — Underneath the fibrous sheath, enveloping each cartilage, is a delicate perichon- drium ; this is most easily seen and dissected off, when the cartilage has been soaked in water for some time; on the anterior part of the cartilage it is very inti- mately connected with the fibrous sheath. Structicre of the Cartilages. — The tracheal carti- lages present no great peculiarity of structure 5 they are composed of cells lying in a matrix. The cells vary in size and shape, and contain nuclei, oil- globules, and granular matter. At the external border of the cartilages the cells are arranged parallel to the sui'face, transversely, and they are more nume- rous, smaller, and more oblong than in the interior. Towards the centre the cells become larger and more spherical, and less numerous and compact, whilst, as they approach the inner surface, they assume the shape and disposition of the external ones, but are not quite so numerous. Many of the cells, especially the more central ones, have distinct markings, giving them a double or even triple-like appearance. Acetic acid renders the outline of the cells more distinct, and brings the nuclei and granular matter more clearly into view. (Fig. 2, page 72.) Structure of the Perichondrium.—This is composed of a very thin layer of white fibrous tissue. Use of tJie Cartilages.—The cartilages form a most important part of the trachea; they tend to keep the tube always patent — a condition essential to the process of respiration; by their deficiencv