Manual of human histology . east at the base of the papillee, theyare quite distinct, in the form of one or two delicate trunks,with 5—10, dark edged primitive fibrils of 0-003—0-003,which gradually become finer as they run towards the point, Ihave been unable to make out with certainty how the nervesterminate, yet everything appearedto indicate the existence of loops,not, however, in the simple papillae,but at their base. In animals theseloops are more distinct, as for ex-ample, in the Calf, where every fili-form papilla receives 10—12 primi-tive fibrils, of 0-002—0-003, whichdiminish to 0 00
Manual of human histology . east at the base of the papillee, theyare quite distinct, in the form of one or two delicate trunks,with 5—10, dark edged primitive fibrils of 0-003—0-003,which gradually become finer as they run towards the point, Ihave been unable to make out with certainty how the nervesterminate, yet everything appearedto indicate the existence of loops,not, however, in the simple papillae,but at their base. In animals theseloops are more distinct, as for ex-ample, in the Calf, where every fili-form papilla receives 10—12 primi-tive fibrils, of 0-002—0-003, whichdiminish to 0 001, and do notenter the simple papillae. The papillce fungiformes consistof a clavate primary papilla, whoseentire surface is beset with closelyplaced, conical, secondary papillae,01—012 in length, and investedwith a simple epithelium, such asis met with elsewhere in theoral cavity, without filiform pro-cesses, or any very horny cells, and which, measured fromtheir points, has a thickness of 004—0*05. The primary. Fig. 174. A, papilla fungiformis, with its secondary or simple papillae, i?, on oneside still covered with epithelium, e, x 35. B, the same, with only the outUnes pf theepithelium, e, and the vessels; a, artery; v, vein; d, capillary loops of the simplepapillae; e, capillaries in the simple papilla of the mucous membrane at the base ; x 18 diam. After Todd and Bowman. II. 2 18 SPECIAL HISTOLOGY. papilla contains far less elastic tissue than the papillae fill-formes, and it is almost wholly wanting in the secondary pa-pillse; on the other hand, a network of bundles of connec-tive tissue of 0-002—0-003 in breadth, is very distinct. Thevessels present the same arrangement as in the p. filiformes,only that they are much more numerous; and as regardsthe nerves, one or two larger trunks of 004—OOS, enterinto every fungiform papilla, together with many minutefilaments, which, spreading out in the form of a brush, andrepeatedly anastomosing (
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Keywords: ., bookcentury1800, bookdecade1850, booksubjecthistolo, bookyear1853
