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Updated: June 1, 2025
It is covered with epidermic cells which multiply rapidly, thus accounting for the rapid growth of the hair. Around each papilla is a bulbous expansion, the hair bulb, from which the hair begins to grow. Epidermis of the Foot. It will be noticed that there are only a few orifices of the sweat glands in this region. The cells on the papillæ are the means by which the hairs grow.
Such impulses originate at the fiber terminations which are found in both the muscles and their tendons. By muscular sensations one is conscious of the location of a contracting muscle and of the degree of its tension. They also make it possible to judge of the weight of objects. B. Section through a papilla. n. Small nerve connecting with taste buds at d. e. Epithelium.
The irregular bones of the pelvis, unnamed on account of their non-resemblance to any known object. Minute crystals of lime in the vestibule of the ear; also known as otoliths. The roof of the mouth, consisting of the hard and soft palate. A violent and irregular beating of the heart. Papilla. The small elevations found on the skin and mucous membranes.
An eminent physiologist accounts for the presence of rudimentary organs, by supposing that they serve to excrete matter in excess, or injurious to the system; but can we suppose that the minute papilla, which often represents the pistil in male flowers, and which is formed merely of cellular tissue, can thus act?
This papilla consists of vascular dermal, i.e. mesodermic tissue, and if the feather is pulled out during growth bleeding occurs. The epidermic horny tube splits posteriorly towards the apex of the feather, and is divided into rachis and barbs, and thus the dermal tissue within, by this time dead and dry, is exposed and is shed.
They had advanced but a few miles when they were met by several panic-stricken regiments, who announced that the Austrian lines had been broken in two places, that General Papilla had been forced to retreat, and that the victorious Turks were pouring their vast hordes into Hungary.
The large median papilla, just behind the posterior pair, surrounds the termination of the intestines, and through it the excrement is voided, the insect for this purpose turning back the abdomen as she hangs head downward, so that neither the web nor the spinners shall be contaminated.
The tendrils and the flower-peduncles rise close side by side; and my son, William E. Darwin, made sketches for me of their earliest state of development in the hybrid P. floribunda. The two organs appear at first as a single papilla which gradually divides; so that the tendril appears to be a modified branch of the flower-peduncle.
Beside these six papillæ there is, just in front of the anterior pair, a single small papilla on the middle line, the nature and use of which I have not ascertained, though I feel quite sure that no silk comes from it.
If the hair has been pulled out from the root, the microscope will show that the bulbous root has a concave surface which fitted over the hair papilla, or that the root is encased in a fatty sheath.
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