A small projection of tissue at the base of a hair or tooth or feather

Usage examples of papilla.

Besides the glands, both surfaces of the leaves and the pedicels of the tentacles bear numerous minute papillae, which absorb carbonate of ammonia, an infusion of raw meat, metallic salts, and probably many other substances, but the absorption of matter by these papillae never induces inflection.

After a leaf had been left in a weak infusion of raw meat for 10 hours, the cells of the papillae had evidently absorbed animal matter, for instead of limpid fluid they now contained small aggregated masses of protoplasm, which slowly and incessantly changed their forms.

A similar result followed from an immersion of only 15 minutes in a solution of one part of carbonate of ammonia to 218 of water, and the adjoining cells of the tentacles, on which the papillae were seated, now likewise contained aggregated masses of protoplasm.

These two-celled papillae apparently correspond with the bifid process in the upper part of the bladders of Utricularia.

If the creature perished within the spiral arms, its decaying remains would be absorbed and utilised by the bifid papillae.

The two terminal cells of the papillae first become much elongated in a line parallel to the inner surface of the bladder.

They are covered exteriorly with papillae of different sizes, many of which have an elliptical outline.

The filiform papillae are generally long and pointed and are found over the entire surface of the tongue.

It is now pretty satisfactorily established that the circumvallate, or fungiform papillae are the only ones concerned in the special sense of taste.

I switched on the little light on the ophthalmoscope and peered into the depths of that most magical and delicate of all organs, down through the lens to the brilliant tapestry of the retina with its optic papilla and branching blood vessels.

Middle ear bones transmit the drum vibrations to the papillae in the fluid of the otic capsule.

In ainhum there is, first, simple hypertrophy, then active hyperplasia The papillae degenerate when deprived of blood supply, and become horny.

I may here add, in order not to recur to the papillae, that they do not secrete, but are easily permeated by various fluids: thus when living or dead leaves are immersed in a solution of one part of chloride of gold, or of nitrate of silver, to 437 of water, they are quickly blackened, and the discoloration soon spreads to the surrounding tissue.

A similar result followed from an immersion of only 15 minutes in a solution of one part of carbonate of ammonia to 218 of water, and the adjoining cells of the tentacles, on which the papillae were seated, now likewise contained aggregated masses of protoplasm.

Similar papillae abound on the rhizomes, and even on the entire leaves, but they are rather broader on the latter.