Figure 2. Position of amphid cilia in AMso and AMsh.

(A–B) Sagittal TEM sections of a P. pacificus young adult hermaphrodite. (A) The yellowish shading highlights the narrow amphid channel, which is formed by the socket cell process and contains the distal segments of the 13 amphid cilia. The lilac shading highlights the expanded region of the amphid sheath cell process, which harbors the proximal segments of the amphid cilia in its anterior lumen and, more posteriorly, the finger cell in its cytoplasm amidst a multitude of vesicles. Arrows point at the space taken up by the finger cell cilium with its projections. Scale bar: 5 µm. (B) Detail of A (from a neighboring section) showing the different ciliary regions: middle segment (ms), transition zone (tz), and periciliary membrane compartment (p). The arrow points at cilia in the narrow, matrix-filled amphid channel. Arrowheads mark the adherens junctions between the AMsh and AMso processes. The red arrowhead indicates the ciliary rootlet within the periciliary membrane compartment (p) of one of the amphid neurons. Scale bar: 1 µm. (C) Transverse section through the periciliary membrane compartment of the amphid finger cell with central rootlet (red arrow head) and numerous fingerlike villi in various orientations. The dotted line in A represents the approximate plane of sectioning. Scale bar: 1 µm. The order of each dendrite entry is shown in Figure 2—figure supplements 1 and 2. Comparative sagittally sectioned C. elegans nose images are present at http://www.wormatlas.org/hermaphrodite/neuronalsupport/jump.html?newLink = mainframe.htm and newAnchor = Amphidsensilla31 (Figure 35). Figure 2—figure supplements 1 and 2.

Figure 2—figure supplement 1. Posterior-anterior path of amphid dendrite entry into the left sheath glia of specimen 107.

The entering dendrite is labeled in white by a number from 1) to 11) according to the order of entry followed by its P. pacificus name. Section numbers from anterior tip of head and direction of entry are given at the bottom of each image. One section is 50 nm. To demonstrate the variability of entry sites between left and right side in this specimen, AM3 to AM6 have been labeled in color.

Figure 2—figure supplement 2. Posterior-anterior path of amphid dendrite entry into the right sheath glia of specimen 107.

The entering dendrite is labeled in white by a number from 1) to 11) according to the order of entry followed by its P. pacificus name. Section numbers from anterior tip of head and direction of entry are given at the bottom of each image. One section is 50 nm. To demonstrate the variability of entry sites between left and right side in this specimen, AM3 to AM6 have been labeled in color.