silver stains of the myenteric plexus by smith 's method showed : ( a ) patchy loss of nerve tracts with replacement by schwann cells , ( b ) degeneration and decreased numbers of both argryophilic and argyrophobic neurons , ( c ) fragmentation and dropout of many axons , and ( d ) increased thickness and disorganized spatial arrangement of other axons .
C0027882
neurons
C0004461
axons