366 NORMAL HISTOLOGY AND ORGANOGRAPHY. 



medullated. The latter terminates in tactile discs 

 that are interposed between the tactile cells. A 

 group of three cells will have two discs ; five cells 

 will have three discs. 



3. Corpuscles of Herbst. These are much larger 



bodies and may also 

 be found in the bills 

 of aquatic birds, in 

 close association 

 with the tactile cells 

 just described. 

 They are ovoid 

 bodies 75^ wide and 

 150 p. long. There 

 is an inner core sur- 

 rounded with con- 

 nective-tissue lamel- 

 lae. The core con- 

 tains the axis cylin- 

 der, which is thick- 

 ened at the end and 

 is encased between 

 two rows of cells that 

 seem to have the 

 same function as 

 Grandry's corpus- 

 cles . The nerve fiber 



enters at the end of the corpuscle and becomes 

 non-medullated only after reaching the inner core. 



4. Meissner's Corpuscles. These are found beneath 

 the epidermis of man, particularly of the hand and 

 foot, and occupy the dermal papillae of the dermis. 



Fig. 259. Meissner's tactile corpus- 

 cle; methylene-blue stain (Dogiel, "In- 

 ternat. Monatsschr. f. Anat. u. Phys.," 

 vol. ix). 



