Labels:barrel | bench | blastocyst | book | bulletin board | door | earth | frisbee | gastrula | ootid | plant | pot | road | sky | tree | windowpane OCR: SHEATH COME AXONS (the fibres that carry impulses away from nerve cells) are surrounded by sheath. It is not a continuous sheath but one made up segm ents laid end to end. Each segm ent is produced by one cell, which wraps itself many times around the axon to give layered cover as you see ir this cross- section. The axon sheath allows nerve impulses to travel more quickly and effic: iently. Axon Sheath Sheath cell segmenti
