194 



COMPARATIVE ANATOMY 



Fio. lo-iA.— A Tactile 

 Spot fkom the Skin 

 OF THE Frog. Semi- 

 diagrammatic. (Modi- 

 fied from ilerkel. ) 



iV, nerve, wliicli loses its 

 mediillarj' sheath at JV^ ; 

 a, a, neuro-epitheliiim ; 

 h, epidermis. 



Fig. 154r;. — A Tactile ConpnscLE (End-Btjlb) 

 FROM THE Margin of the Conjunctiva of 

 Man. (After Dogiel. ) 



ii, meduUated nerve fibre, the axis-fibre of 

 which passes into a closely coiled terminal 

 skein ; b, nucleated fibrous investment. 



Fig. 154e. — Uekmal Papilla 



FROM the Hi'MAK FiNOER 



ENCLOSING A Tactile Cor- 

 puscle. ( After Lawdowski. ) 



.(, fibrous and cellular invest- 

 ment ; 6, tactile corpuscle, 

 with its cells; it, nerve-fibre ; 

 ■n', the further course of the 

 nerve-fibre, showing its 

 curves and bends ; m", termi- 

 nal twigs of the nerve-fibres 

 with clul)-shaped endings. 



Fig. 154d. — Transverse Section 

 THROUGH a Tactile Corpuscle 

 FROM THE Beak of a Ducii. 

 (After Carriire. ) 



II, nei've, entering the capsule K, 

 its sheath (iS) becoming con- 

 tinuoxis with the latter. The 

 nerve passes between the two 

 covering-cells, DZ, DZ, widen- 

 ing out to form a tactile plat& 

 at n^. 



