ioi8 



HUMAN ANATOMY. 



873- 



Cylindrical ctul-bulb from con- 

 no ti\<- tissue layer of skii. 

 (Stymonowicz. ) 



a number of bold curves and twistings. Afu-r the disappearance of their sheaths, 



the naked axis-cylinders undent > repeated divisions, tin- resulting fibrillae becoming 



varicose- and inu-rt wined and ending in free terminal 

 knob-like enlargements. 



In contrast to the foregoing end-organs, in which 

 the axis-cylinder subdivides into numerous terminal 

 threads disposed as more or less elaborate intertwinings, 

 :ul group is distinguished by the possession of a 

 thick laminated capsule that encloses a cylindrical core or 

 inner hulb containing the slightly branched axis-cylinder. 

 < -Tidings, of which the Pacinian corpuscle is repre- 

 sentative, an- relatively large and ellipsoidal. 



A transitional form, connecting them with the 

 spherical end-bulbs, is presented by the cylindrical 

 end-bulbs of Krause. These are found in various 

 parts of the corium, the oral mucous membrane and 

 between the bundles of striped muscle and of tendon. 

 They are irregularly cylindrical in form, often more or 



less bent, and consist of a thin laminated capsule that encloses a core of semifluid 



substance in which lies the centrally placed axis-cylinder. The latter, after losing 



the nn-dullary sheath on entering at the proximal end of the capsule, traverses the 



core without branching until near the distal pole, where it ends in a single or slightly 



subdivided terminal enlargement 



The Vater-Pacinian Corpuscles. These structures, the most highly special- 

 ized sensory end-organs, are relatively large ellipsoidal bodies, from .5-1.5 mm. in 



length and about one-third as much in breadth, situated within the connective tissue 



in many parts of the body. 



In man they are found in FIG. 874. 



the deeper layer-, of the 



connective tissue layer of 



the skin, especially on the 



palmar and plantar aspects 



of the fingers and toes, in 



the connective tissue in the 



vicinity of the joints, in 



tendi.ns, in the sheath of 



muscles, in the periosteum 



and in the tunica propria 



of the serous membrane-,. 



the peritoneum, pleura and 



pericardium. They are 



particularly large in the 



mesentery of the cat, where 



they may be readily de- 



1 with the unaided eye 



.il pearly bodies smne- 

 times two millimeters or 

 more in length. 



The most conspicuous 

 part of the Pacinian body 

 is the mlnist ctipsu/i- that 



litutes almost the en- 

 tire bulk of the corpuscle 



ami < insists of from one 

 to three do/en thin con- 

 centric lamell.i- of til'- 



tissue. The surfaces of tile 



i.unell.r are ic. \-ered with endothelial plates whose nuclei appear as fusiform thicken- 

 ings, along t: :.tric stri.e of the corpuscle. The axis of the Pacinian body 



\ 



verso section ; *, nerve eiiti-iiiiK i:i|>Milr to n-:u h inner b 



aneit 

 ulb. 





