. Texte-livre de l'histologie normale: Y compris un compte rendu du développement des tissus et des organes. Interne, plus lâche strate reticulare ;aucune démarcation nette existe entre les deux, le papillarv se mélangeant avec le réticulaire, tandis que le dernier passe graduallydans les tissus de la strate sous-cutanée. Les papilles varient en taille, en nombre et en disposition dans différentes régions, étant les mieux développées et les plus nombreuses sur la surface palmarrée des mains et des doigts et sur les parties correspondantes des pieds, où elles atteignent une hauteur de 0,25 mm.; d'autre part, les papilles peuvent b

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. Text-book of normal histology: including an account of the development of the tissues and of the organs. inner, looser stratum reticulare ;no sharp demarcation exists between the two, the papillarv layerblending with the reticular, while the latter in turn passes graduallyinto the tissues of the subcutaneous stratum. The papillae vary in size, number, and disposition in differentregions, being best developed and most numerous on the palmarsurface of the hands and the fingers and on the corresponding partsof the feet, where they attain a height of .25 mm.; on the otherhand, the papillae may be very slightly developed or even absent.These elevations consist of closely-arranged bundles of fibro-elastictissue, and support the vascular loops together with the rich ter-minal nerve-supply; in certain localities the latter includes thehighly-specialized tactile corpuscles of Meissner, the corpuscles ofVater, and the various end-bulbs which already have been describedin Chapter VI. The simplest type of the papillae is the roundedor blunted conical elevation, but very often such projection becomes. Section of negros skin, including epidermis(a) and papillary layer of corium (i) ; thedeepest layers of epidermis (c) contain thepigment. THE SKIN AND ITS APPENDAGES. 261; cleft and converted into one of the compound variety. Thepapillffi of the hand and the foot are distributed in charactefisti-cally-arranged rows, which form elaborate, and for each individualconstant and distinctive, ridges on the integumentary surface. Theseridges have been found to retain their definite arrangement, orpatterns, from early life to old age unchanged. This constancyin the details of the surface markings has been taken advantage ofin securing records by means of impressions for the purposes ofidentification. Non-striped muscular tissue occurs within the corium in con-nection with the hair-follicles, as the arrectores pilorum, and in thesubcutaneous tissue, attached to the under surface of the cor

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