Quain's elements of anatomy . ayers of the perineurium, and theinterstices between the fibres are occupied by a considerable quantityof watery fluid, probably of the nature of lymph, and containing occa-sionally lymph-corpuscles. This fluid in the fresh state tends toobscure the delicate fibres of the lamellse, so that the adjacent layersof epithelioid cells belonging to the successive lamellge stand out sharply PACINIAN BODIES. 167 Fie. 16/ when the corpuscle is viewed in optical section, and were long taken torepresent the actual tunics of the organ. The epithelioid layers are nothowever eve
Quain's elements of anatomy . ayers of the perineurium, and theinterstices between the fibres are occupied by a considerable quantityof watery fluid, probably of the nature of lymph, and containing occa-sionally lymph-corpuscles. This fluid in the fresh state tends toobscure the delicate fibres of the lamellse, so that the adjacent layersof epithelioid cells belonging to the successive lamellge stand out sharply PACINIAN BODIES. 167 Fie. 16/ when the corpuscle is viewed in optical section, and were long taken torepresent the actual tunics of the organ. The epithelioid layers are nothowever everj^vhere insuch close juxtaposition,but are here and thereseparated from oneanother by interlamellarspaces which are occupiedby lymph, and representthe lymphatic clefts be-tween the layers of theperineurium of a nerve. The nerve-fibre, thedisposition of which maynow be noticed, is con-ducted along the centreof the stalk, enters thecorpuscle, and passesstraight into the core, atthe further end of whichit terminates. As shoA^Ti. Fig. 167. DiAGKAMlIATIC REPRESENTATION OF TWO TUNICS OF A Pacinian corpuscle in transverse SECTION. a, a, epithelioid layers ; b, b, connective tissuelayer, more condensed near the surface; c, opennetwork of fine elastic fibres in the substance of thelamella. Fig. 168.—Pacinian corpuscle froji the Fig. 1( mesentery of the cat ; stained withnitrate of silver. Magnified. The epithelioid cells of the outermosttunic are shown, and their continuity, atthe peduncle, with those of the correspond-ing layer of the perineurium (from a, drawingby G. C. Henderson). by Pacini, the layers of the peri-neurium successively become con-tinuous with, or rather expand intothe tunics of the corpuscle. Since,however, in most Pacinian cor-puscles there are many more tunicsin the corpuscle than layersof the perineural sheath whichinvests the entering nerve, it isonly a few of the tunics which arethus continuous; and it will begenerally found that it is the outerones which are
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