part_of adult peripheral nerves adult peripheral nerve neurilemma Fig. 14-21, Fig. 14-22, Fig. 14-23. TADS:0000555 TADS:0000555 The peripheral nerve neurilemma is the amorphous, non-cellular layer that surrounds each nerve. The neurilemma extends into the body of the nerve to form mesaxons, an extension of the neurilemman that encloses individual axons or groups of axons within the body of the nerve. This is a unique feature of ticks. default_namespace