168 



PERIPHERAL NERVE TERMINATIONS: END ORGANS 



Pacinian corpuscle consists of a thick lamellated connective tissue coat, 

 and a central granular protoplasmic core which is pierced by the nerve 

 fiber. The medullated nerve fiber enters the axis of the corpuscle, its 

 Henle's sheath becoming continuous with the superficial capsule of con- 



FIG. 186. A LAMELLAR CORPUSCLE IN 

 LONGITUDINAL SECTION, SHOWING 

 A NETWORK OF SPIRAL ELASTIC 

 FIBERS. 



Weigert's elastic tissue stain. Highly 

 magnified. (After Sala.) 



c &.. 



FIG. 187. AXIAL SECTION OF A COR- 

 PUSCLE OF HERBST FROM A DUCK'S 

 TONGUE. 



a, medullated nerve fiber; b, naked 

 axial nerve fiber with a bulbous end; c, 

 nuclei of the core; d, inner concentric 

 capsule; e, nuclei of the outer lamellated 

 capsule. X 380. (After Sobotta.) 



nective tissue. The nerve fiber on entering the core loses its medullary 

 sheath, and after traversing a greater or less portion of the core divides 

 into two to five branches which end near the distal pole in a disk-like 

 expansion. In its course through the core, the nerve fiber gives off fine 

 lateral twigs (Sala, Retzius). 



The connective tissue sheath consists of a granular protoplasm which 



