On some cutaneous nerve-terminations in mammals / by George Hoggan and Frances Elizabeth Hoggan ; communicated by James Murie.

  • Hoggan, George.
Date:
[1882]
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Licence: Public Domain Mark

Credit: On some cutaneous nerve-terminations in mammals / by George Hoggan and Frances Elizabeth Hoggan ; communicated by James Murie. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    On some Cutaneous Nerve-terminations in Mammals. By Dr. G-EOEGE HoGGAN, and Dr. Feances Elizabeth Hoggan. (Communicated by Dr. James Mubie, P.L.S.) [Bead June 1,1882.] (Plates Xin.-XVI.) Contents :—Introductory remarks on the organ of Eimer in the Mole. Habits shown by a Mole in confinement. Nerve-distribution upon hairs. Medullated nerves passing to hairs. Nerves terminating in branched cells on hairs. Forked nerve-terminations on hairs. Deve- lopment of nerve-terminations on hairs. Jobert's coil of nerve-fibrils surrounding; folHcle. Intraepithehal nerve-fibrils of outer root-sheath. Structure of organ of Eimerin the Mole :—Inner circle of nerve-fibrils; the ganglion-cells ; outer circle of nerve-fibres. The organ of Eimer a retrograded hair-follicle. Eifect of habit in causing evolution of the organ of Eimer. The tail of the Mole as a special tactile organ. Ranvier's hypothesis of directiou of growth in nerves. Merkel's hypo- thesis of different functions of cutaneous nerves. Ranvier's objection to Merkel's views. Our proofs that nerve-cells and intraepidermic nerves are continuous. Origin of the cells of Langerhans. Have the intraepidermic nerves any function ? Professor Ranvier's hypothesis negatived. Subepidermic plexus of nerve-cells and fibres. Conclu- ding remarks on the organ of Eimer. Introductory Semarhs on the Organ of Eimer in the Mole. A considerable portion of the present paper was prepared for tliis Society at the beginning of the present year (1882) under the head- ing The Nerve-terminations in the Insectivora as modified by their habits; but a short time aftervrards we found that part of what we had supposed to be discoveries of our own had already been published by others, and notably by Arnstein* and Bonnet f. It became necessary therefore to recast the whole; and if we could not present much that was original in discovery, we could at least, under the present title, give many deductions and amend- ments connected with facts discovered that are new in themselves, and opposed to many hypotheses held at the present day. Taking as our text that beautiful and unique arrangement of nerve-terminations in the snout of the Mole, whicli has been called, after its discoverer, the organ of Eimer (figs. 1 & 2, Plate XIII.), we shaU endeavour to analyze its component elements, and, in giving the history or description of each, to warrant our assumption of the title prefixed to this article. We shall also * Sitzungsberichte dcr k.-k. Akad. Wien, 1878, Abth. 3. t Morphologisches Jahrbuch, 1878, vol. iv. p. 329. A full list of the litera- ture coHBulted will be found at the end of this paper, page 692.