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to penetrate far into the epithelium, sometimes as far as the super- 
ficial layers of cells. In the other half of the tongue, where the 
fibres of the hypoglossus nerve are regenerating along the nerve paths 
of the lingualis, one sees often strikingly how the nervous fibrillae 
grow right up against the basal side of the epithelium, but then do 
not penetrate it, but turn round and descend again, ending inside the 
connective tissue with an endknob or endnet, or run for a shorter 
or longer distance along the basal side of the epithelium es if seeking 
entrance, and then turn round and end between the elements of the 
connective tissue as described above (fig. 1 a, 6, c). 
In the second place it is an interesting fact, that the terminal 
branches of the hypoglossus nerve fibres often show a striking 
resemblance to the endplates formed on the muscle fibres during 
regeneration after simple cutting of the hypoglossus nerve («-group 
of experiments). An example is given in the figs. 2 and 3. In fig. 2 
is drawn a set of terminal branches formed by a hypoglossus nerve 
fibre against the basal membrane of the epithelium, in fig. 3 is drawn 
a regenerated motor end-plate on a muscle fibre of the tongue after 
ett ar 
ie EN ve 
Fig. 2 Terminal branches of a hypo- Fig. 5. Regenerated motor end- 
glossus nervefibre in the connective plate on a muscle fibre of the 
tissue of the mucous membrane of the tongue (hedgehog group a). 
tongue (group 0). 
