Enlargements of the Spitzenkörper region from 3 sections taken from the same series as in fig 8c & 8d. The apical plasma membrane (pm) is at the far right in each figure and numerous apical vesicles (v) surround the relatively vesicle-free core region. Arrow heads show fiborous or filamentous structures that overlap each other or branch within or near the core. Arrows point to smooth tubular profiles in the core region. All three figures are shown at the same magnification. Scale bar = 1 µm