194 



Basic Structure of Vertebrates 



CLUB-SHAPED 

 TACTILE CORP. - 

 (KRAUSE) 



ENCAPSULED 

 NERVE- KNOT 

 (GOLGI-MAZZDNI) 



_ NERVE - 

 -ENDING IN 

 EPIDERMIS 



FREE NERVE- 

 ENDING IN 

 CORIUM 



ENCAPSULED 

 GROUP OF 

 TACTILE CELLS 

 (MEISSNER) 



DIAGRAMS B.-D. CUTANEOUS SENSE ORGANS IN CRANIOTES WITH SECONDARY SENSE CELLS. 



Fig. 164. Varieties of cutaneous sense-organs in chordates. (A-C) Sensory 

 terminations in the skin of Amphiorus. (BMD 3 ) Varieties of terminations in 

 vertebrates. (C'-C 4 and D'-D 3 ) respectively represent probable stages in the 

 evolution of encapsuled nerve-terminations of two different types. (After Plate. 

 Courtesy, Neal and Rand: "Chordate Anatomy," Philadelphia, The Blakiston 

 Company.) 



Axis cylinder. 



Fig. 165 (Left). Small lamellar corpuscle from the mesentery of a cat. The nuclei 

 of the capsule cells appear as thickenings on the walls of the capsules. The myelin 

 of the nerve-fiber may be traced to the inner core. (X 50.) (Courtesy, Bremer: 

 "Text-Book of Histology," Philadelphia, The Blakiston Company.) 



Fig. 166 (Right). Meissner's corpuscle. (Courtesy, Kingsley: "Comparative 

 Anatomy of Vertebrates," Philadelphia, The Blakiston Company.) 



