Fig. 1.5.38.  The axon initial segment (details from Fig. 1.5.07). A 30-50 nm thick granulo-filamentous subplasmalemmal scaffold reveals a periodicity about 10 nm (red lines). The ankyrin G-spectrin-actin complex is spanning from the axolemma to protein bridges among linked microtubules (arrow). 

(cf: Huang YM, Rasband MN: Ann N Y Acad Sci. 2018 May; 1420(1): 46–61. doi:10.1111/nyas.13718. Leterrier C. et al.: 2015, Cell Reports 13, 2781-2793.)