interfacial epithelial cell accessory cell neuronal sheath cell worm_anatomy WBPaper:00038216 a structural (glial) cell which forms an specialized environment surrounding the sensory ending(s) of one or more neurons; sometimes accompanied by a more distal socket cell. In early development of the sensory nerves and of the nerve ring some sheath cells (cephalics and labials) may also provide a substrate for axon guidance WBbt:0005811 pocket cell