11. This image is copyright Dennis Kunkel at www.DennisKunkel.com , used with permission.
12. Cross section of myelin sheaths that surround axons (TEM x191,175). This image is copyright Dennis Kunkel at www.DennisKunkel.com , used with permission.
13. (De acuerdo a función - A que lugar transmiten el mensaje)
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20. Structure of a nerve bundle. Image from Purves et al., Life: The Science of Biology , 4th Edition, by Sinauer Associates ( www.sinauer.com ) and WH Freeman ( www.whfreeman.com ), used with permission.
21. Na + Na + Na + Na + Na + Na + K + K + K + Na + Na + K + K + K + K + Na + 1 2 3 4 Figure 34.5d Page 583