NERVE ENDINGS, STOMACH AND SMALL INTESTINE 590 
cells of connective-tissue origin falling in the same category as 
the so-called ‘interstitial ganglion cells’ of Ramon y Cajal. 
Ploschko (97) found intermuscular ‘Endbiumschen’ in the wall 
of the trachea. ‘These arborescent endings appear to be of sen- 
sory type. They will be referred to again in connection with the 
description of somewhat similar terminations present in the 
muscularis of the intestine. 
ENDINGS IN THE LONGITUDINAL MUSCLE OF THE CARDIAC 
STOMACH OF THE CAT 
In a series of sections of the cardiac stomach of the cat stained 
intra-vitam with methylene blue there appear in the longitudinal 
muscle layer numerous nervous structures, many of them termi- 
nal, which seem to be receptive rather than effective in type. 
They are wholly different in their structural details from the 
simple motor endings which have previously been described as 
terminating on the cells of involuntary muscle tissue. They 
have so far been found only in the longitudinal layer of the mus- 
cularis and in the thin serous coat external to it. In the latter 
tunic a few have been seen in the connective tissue subjacent to 
the peritoneal epithelium; but the great majority are confined to 
the region of the longitudinal muscle. Not one of these struc- 
tures has as yet been seen in the circular muscle layer or else- 
where in the stomach wall. 
The structures in question may be described as, (1) skeins and, 
(2) networks of very fine varicose fibrils. The fibrils arise from 
the division of nerve fibers of somewhat larger caliber, which also 
show varicosities, and which appear to be non-medullated as far 
as they have been traced. ‘Their source has not been determined, 
but they have been followed in a central direction close to the 
region of the myenteric plexus. 
The delicate fibrils composing a typical skein (fig. 1) lie for 
the most part roughly parallel to one another, and form a rather 
wide, loose bundle which is often spirally twisted. The skein 
may terminate a fiber, frequently branching to make a T-shaped 
ending, or it may occur midway in the course of a fairly compact 
strand of fibrils derived from a fiber by the splitting up of the 
latter. 
