in fetuses at term , the interstitial cells of cajal are not found and their precursor cells are not identifiable among the cells present in the submucosal area facing the circular muscle layer , i.e. , undifferentiated cells ( mainly close to nerve fibers ) and fibroblast-like cells ( contacting each other and the developing smooth-muscle cells ) .
C0018956
precursor cells
C0007634
cells