Inner labial sensilla are found on the apex of each lip in a symmetrically arranged manner (ILDL/R,ILLL/R, ILVL/R). Each of these sensilla contain 2 dendrites (IL1 and IL2 dendrites) as well as one sheath and one socket cell. The dorsal and ventral lips also contain the outer labial quadrant sensilla (OLQDL/R and OLQVL/R), whereas the lateral lips contain outer labial lateral sensilla (OLLL/R). Each of the outer labial sensilla have only one outer labial sensory neuron dendrite ending and one sheath and one socket cell. Unlike amphids, inner and outer labial sensillar socket channels are not lined with cuticle. IL1 neurons are mechanosensory (Hart A. et al. 1995; Kaplan J. and Driscoll M., 1997), but from their structure, they are also suggested to carry out interneuron and motor neuron functions. IL2 neurons are postulated to be chemosensory. Similar to IL1s, OLQ neurons are mechanosensory (Hart A. et al. 1995; Kaplan J. and Driscoll M., 1997), but they may also function as interneurons. OLL neurons are suggested to function as mechanosensory (Perkins et al., 1986) neurons. Note that in the schematic depictions GliaFig.s 38-40, posterior processes of neurons are not shown for simplicity.
Left side inner labial sensilla
Left side outer labial sensilla
Inner and outer labial socket cells
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