Manual of human histology . iformes or conicce (fig. 173), are conical pro-cesses of mucous membrane beset either at their extremities only, or over their whole^ ^ surface, with a certain number (5—20) of smallersecondary papiUie of 0*1—0-14 in length. Thewhole is invested with athick epithelial coat drawnout at its extremity intoa number of long, thin(0-01—0-02), fine andoften subdivided, processes(fig. 173, /), which givethe papilla the aspect ofa fine brush, and mayattain a length of as muchas 0-5—0-6—0-7, with abreadth of 0-02—0-028at their base. The super-ficial layers of this epi-thelium
Manual of human histology . iformes or conicce (fig. 173), are conical pro-cesses of mucous membrane beset either at their extremities only, or over their whole^ ^ surface, with a certain number (5—20) of smallersecondary papiUie of 0*1—0-14 in length. Thewhole is invested with athick epithelial coat drawnout at its extremity intoa number of long, thin(0-01—0-02), fine andoften subdivided, processes(fig. 173, /), which givethe papilla the aspect ofa fine brush, and mayattain a length of as muchas 0-5—0-6—0-7, with abreadth of 0-02—0-028at their base. The super-ficial layers of this epi-thelium resemble the epi-dermic plates in their longresistance to the action ofacids and alkalies, andconsist, especially the epi-thelial processes, only of solid horny scales of 0022 to0-028, which frequently form a more solid axis, and of anexternal cortex composed of overlapping plates, so that thewhole mass may, with some justice, be compared to a primary papilla of the p. filiformes contains distinct con-. Fig. 173. Two pajnllce filiformes of Man, one with its epitlieliuni, x 35, afterTodd and Bowman : p,i\\& papillm i\\&%e\\; a, t, arterial and venous vessels ofpapilla, togetlier with the capillary loops, which, however, ought to enter thesecondary papilltje. THE TONGUE. 17 iiective tissue, and a very considerable number of elastic fibrils,which as 10—20 wavy threads of 00004—0-0008, penetrateeven to the points of the simple papillcG, and give to the wholecone and its processes a certain solidity and firmness which arenot possessed by the simple papillcc of tlie mucous minute artery ramifies in each filiform papilla, in such amanner, that every simple papilla contains a capillary loop of0-004—0-005, from whose reunion a small vein arises. It isdifficult to discover the nerves, on account of the abundant elastictissue; and in many papillae they may be sought in vain. Inthe majority, however, at least at the base of the papillee, theyare qu
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Keywords: ., bookcentury1800, bookdecade1850, booksubjecthistolo, bookyear1853
