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Updated: May 9, 2025
This motion is always in the same direction, and serves to carry away mucus and even foreign particles in contact with the membrane on which the cells are placed. This epithelium is especially common in the air passages, where it serves to keep a free passage for the entrance and exit of air. In other canals a similar office is filled by this kind of epithelium. Functions of Epithelial Tissues.
In a case of Sangster, reported by Politzer, although most of the dermoids, as usual, were like fibroma-nodules and therefore the color of normal skin, those over the mastoid processes and clavicle were lemon-yellow, and were generally thought to be xanthoma until they were excised, and Politzer found they were typical dermoid cysts with the usual contents of degenerated epithelium and hair.
Another biological acquisition was the assurance that the circulatory system of the blood is a closed system of vessels, and that the enclosing epithelium is not permeable by non-incisive solid bodies such as vegetable microbes, and still less by rounded protozoa, which are much larger than microbes and soft in substance.
The more detailed study of the body may now be begun by a description of the skeleton or framework which supports the soft parts. Experiments. Experiment 1. To examine squamous epithelium.
Granulations spring up to fill the gap, and are rapidly covered by epithelium, derived partly from the margins and partly from the remains of skin glands which have not been completely destroyed. These latter appear on the surface of the granulations as small bluish islets which gradually increase in size, become of a greyish-white colour, and ultimately blend with one another and with the edges.
For instance, if our patient be of Southern blood, or tanned from the seashore, the good red blood in his arteries is pretty safe to show through at the normal blush area on the cheeks; or, failing that, through the translucent epithelium of the lips and gums.
On a mucous surface the papular eruption assumes the form of mucous patches, which are areas with a congested base covered with a thin white film of sodden epithelium like wet tissue-paper. They are best seen on the inner aspect of the cheeks, the soft palate, uvula, pillars of the fauces, and tonsils.
The malignancy of cancer depends on the tendency which the epithelium has of invading the tissues in its neighbourhood, and on the capacity of the cells, when transported elsewhere by the lymph or blood-stream, of giving rise to secondary growths.
In 1910 Harrison, having placed fragments of an embryo frog in a drop of coagulated lymph taken from an adult, saw them continue their development for several weeks, the muscles and the epithelium differentiating, the nervous rudiments sending out into the lymph filaments similar to nerve fibers. Since 1910 with the aid of Dr.
I found all the varieties of the palmellae you described in the boxes, and I kept them for several years and demonstrated them as I had opportunity. You also showed me on this visit the following experiments that I regarded as crucial: 1st. I saw you scrape from the skin of an ague patient sweat and epithelium with the spores and the full grown plants of the Gemiasma verdans. 2d.
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