OEGANS OF TASTE. 855 



jrior of the bud, amongst the gustatory cells. The gustatory cells occupy the centre 



^ig^ 





g^TT-.i > v^r"."; 

 A 





FIG. 730. 

 A, Section through a papilla vallata of human tongue. B, Section through a part of the papilla foliata 



of a rabbit. 

 1. Papilla. 2. Vallum. 3. Taste buds. 4. Papillae. 5. Taste buds. 6. Duct of serous gland. 



the bud, and each consists of a nucleated cell-body, prolonged into a peripheral 



Gustatory hairs 



Supporting 

 cells 



K^ 

 FIG. 731. 

 quarter surface view of taste bud from the B, Vertical section of taste bud from the papilla 



papilla foliata of a rabbit (highly magnified). foliata of a rabbit (highly magnified). 



and a central process. The peripheral process is rod-like and almost hyaline, and 



terminates at the gustatory pore in a slender 



filament, the gustatory hair. The central 



process passes towards the deep extremity of 



the bud, where it ends free, as a single or 



branched varicose filament. 



Nerves of Taste. The nerve supplying 

 the taste buds over the anterior part of the 

 tongue is the chorda tympani, which is de- 

 rived from the sensory root of the facial 

 nerve ; that for the posterior part is the glosso- 

 pharyngeal. The nerve fibrils, having lost 

 their medullary sheaths, ramify partly be- 

 tween the gustatory cells and partly amongst 

 the supporting cells of the taste buds. 



The ducts of Ebner's glands open into the 

 bottom of the valleys surrounding the papillae 

 vallatae, and the serous-like secretion of these glands probably washes the free 



FIG. 732. ISOLATED CELLS FROM TASTE BUD 



OF RABBIT (Engelmann). 

 a, Supporting cells. b, Gustatory cells. 



