782 



TASTE 



[OH. LV. 



The middle of the dorsum of the tongue is but feebly endowed 

 with the sense of taste; the tip and margins, and especially the 



posterior third of the dorsum 

 (i.e., in the region of the taste- 

 buds), possess this faculty. 

 The anterior part of the 

 tongue is supplied by the 

 lingual branch of the fifth 



Fio. 482. Taste-bud from dog's epiglottis 

 (laryngeal surface near the base), precisely 

 similar in structure to those found in 

 the tongue, a, Depression in epithelium 

 over bud; below the letter are seen the 

 fine hair-like processes in which the cells 

 terminate; c, two nuclei of the axial 

 (gustatory) cells. The more superficial 

 nuclei belong to the superficial (encasing) 

 cells ; the converging lines indicate the 

 fusiform shape of the encasing cells, x 400. 

 (Schofield.) 



FIG. 481. Filiform papillae, one with epithelium, 

 the other without. >\ 6 -. p, The substance of the 

 papillae dividing at their upper extremities into 

 secondary papillae ; a, artery, and v, vein, dividing 

 into capillary loops ; e, epithelial covering, lamin- 

 ated between the papillae, but extended into hair- 

 like processes, /, from the extremities of the 

 secondary papillse. (From KiJlliker, after Todd 

 and Bowman.) 



nerve and the chorda tym- 

 pani, and the posterior third 

 by the glosso - pharyngeal 

 nerve. Considerable discus- 

 sion has arisen whether there 

 is more than one nerve of 



taste. The view generally held is that the glosso-pharyngeal nerve 

 is the nerve of taste, and the lingual the nerve of tactile sensa- 

 tion. Nevertheless, the lingual and the chorda tympani do con- 

 tain taste-fibres, which probably take origin from the cells of the 

 geniculate ganglion; the central axons of these cells pass by the 

 pars intermedia to the sensory nucleus of the glosso-pharyngeal 

 nerve. Gowers holds that the fifth nerve is the only nerve of taste, 

 and has recorded a case of loss of taste where the fifth nerve alone 

 was the seat of disease ; other cases, however, do not support this 

 view. 



