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Fig. 6. The d-root, SMAFs, pbb and proximal connecting fibers. (A-H) Consecutive series showing the d-root in transverse section. The two bbs are sectioned at an oblique angle and the pbb is sectioned longitudinally. (A,B) The distal connecting fiber (B, dcf) and one proximal connecting fiber (A, pcf) are marked. The d-root is linked to the corresponding bb by the df (A,D and inset in D, small arrows). In the more proximal region of the d-root, the corresponding SMAF (E-H, large arrowheads) is overlying both root microtubules (D-G), whereas, more distally, it is overlying only root microtubule 2 (H). The striation pattern of the SMAF is clearly visible in F and G. (E,F) The pbb is connected to the d-root by the lateral striated fiber (see also Fig. 2C,H, large arrowheads). Filaments of the lateral striated fiber (E,F, small arrowheads) extend from an electron-dense plate underlying both microtubules of the d-root (E,F, open triangles) to the side of the pbb (F, open arrow), and some of these filaments (E, small arrowheads) seem also to be connected to the s-root (E,F, s). More distal at the d-root, filamentous material interconnects the pbb with the SMAF (H, double arrowheads). (I,J) Two consecutive serial sections showing the two sets of proximal connecting fibers. The left bb is seen in transverse, the right in longitudinal section. The proximal connecting fiber (I, pcf) shows a complex cross striation. The median proximal connecting fiber (J, arrowhead) is not cross striated and is attached to a hook-like structure (I,J, small arrow). Scale bar, 250 nm.
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