Fig. 5.31. Transitional zone between central and peripheral nervous system in cranial and spinal nerves (T):  C - central nervous tissue, P - peripheral nerve, bm - basement membrane, M - myelinated axon, N - non-myelinated axon, A - astrocyte, O - oligodendrocyte, S - Schwann cell, C - blood capillary, F - fibrocyte, e - endoneurium. (Trigeminal nerve, rabbit.)