256 



COMPARATIVE ANATOMY 



FIG. 187A. - A TACTILE 



SPOT FROM THE SKIN OF 



THE FROG. Semi-dia- 

 grammatic. (Modified 

 from Merkel. ) 



a, a, neuro-epithelium ; b, 

 epiderm; N, nerve, which 

 loses its medullary sheath 

 at N l . 



FIG. 187c. A TACTILE CORPUSCLE (END-BULB, 

 OR KRAUSE'S CORPUSCLE) FROM THE MARGIN 

 OF THE CONJUNCTIVA OF MAN. (After 

 Dogiel.) 



b, nucleated fibrous investment ; n, meclullated 

 nerve fibre, the axis-fibre of which passes 

 into a closely coiled terminal skein. 



FIG. 18?B. DERMAL PAPILLA 

 FROM THE HUMAN FINGER 

 ENCLOSING A TACTILE COR- 

 PUSCLE (MEISSNER'S COR- 

 PUSCLE). (After La wdowski.) 



a, fibrous and cellular invest- 

 ment ; 6, tactile corpuscle, 

 with its cells ; n, nerve-fibre ; 

 n', the further course of the 

 nerve-fibre, showing its curv- 

 ing branches ; n", terminal 

 twigs of the nerve-fibres with 

 club-shaped endings. 



FIG. 187n. TRANSVERSE SECTION 

 THROUGH A TACTILE CORPUSCLE 

 (GRANDRYS' CORPUSCLE) FROM 

 THE BEAK OF A DUCK. (After 

 Carriere. ) 



, nerve, entering the capsule 7i", 

 its sheath (S) becoming con- 

 tinuous with the latter. The 

 nerve passes between the two 

 covering-cells, DZ, DZ, widen- 

 ing out to form a tactile plate 

 at u l . 



surfaces of the hand and foot respectively and on the conjunctiva 

 and snout, and are especially well-marked on the snout in the Mole : 



