Anthony Fan null University of Illinois at Urbana-Champaign, United States Alireza Tofangchi null Beckman Institute of Advanced Science and Technology, Quantitative Light Imaging Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, United States Mikhail Kandel 0000-0003-2124-7750 University of Illinois at Urbana-Champaign, Urbana, Illinois, United States Gabriel Popescu null University of Illinois at Urbana-Champaign, Mechanical Science and Engineering, Urbana, United States Taher Saif null 501100001692 Croucher Foundation 100000001 National Science Foundation (NSF) DGE-0965918 100000001 National Science Foundation (NSF) DGE-1144245 Anthony Fan Alireza Tofangchi Mikhail Kandel 100000001 National Science Foundation (NSF) CBET-0939511 Gabriel Popescu 100000001 National Science Foundation (NSF) CMMI-1300808 100000001 National Science Foundation (NSF) DGE-0965918 100000002 U.S. Department of Health & Human Services | National Institutes of Health (NIH) NINDS NS063405-01 100000001 National Science Foundation (NSF) CBET-0939511 Taher Saif Coupled circumferential and axial tension driven by actin and myosin influences in vivo axon diameter