Select a cell A-O ADA ADE ADF ADL AFD AIA AIB AIM AIN AIY AIZ ALA ALM ALN AQR ASE ASG ASH ASI ASJ ASK ASn AUA AVA AVB AVD AVE AVF AVG AVH AVJ AVK AVL AVM AWA AWB AWC BAG BDU CAN CEP DAn DBn DDn DVA DVB DVC FLP GLR HSN IL1 IL2 LUA OLL OLQ

Select a cell P-V PDA PDB PDE PHA PHB PHC PLM PLN PQR PVC PVD PVM PVN PVP PVQ PVR PVT PVW RIA RIB RIC RID RIF RIG RIH RIM RIP RIR RIS RIV RMD RME RMF RMG RMH SAA SAB SDQ SIA SIB SMB SMD URA URB URX URY VAn VBn VCn VDn

Click pictures for higher resolution images

Members: AQR; PQR.

Although AQR and PQR have been given different class names, they have several features in common and so have been grouped together. Each is derived from an equivalent position on bilaterally symmetrical lineages (Sulston & Horvitz 1977) and each has a small cilium, which is not part or a sensillum but is free in the body cavity (b). The cell body of AQR is situated laterally on the right-hand side near the posterior bulb of the pharynx. The cilium is on a small process emanating from the cell body (i). The cell body of PQR is in the left lumbar ganglion and its cilium is near the end of a posteriorly directed process (j). The main process of AQR enters the ventral cord via the right-hand deirid commissure and runs anteriorly. It splits near the nerve ring and the two branches run round each side or the nerve ring, near the middle orthering neuropile and in close association with the process of DVA. The processes or AQR end without meeting near the dorsal mid-line. The main synaptic output is to AVB (a, c), AVA (c, e), RIA (d), BAG (d), PVC (a) and AVD. AQR has noticeably denser clusters or vesicles presynaptically than most of the other classes of neuron. There is some synaptic input from DVA (*c) and many gap junctions to PVP and also some to AVK (*f) and RIG. PQR sends an anteriorly directed process that enters the pre-anal ganglion and runs anteriorly in the ventral region of the process bundle, eventually ending somewhere in the posterior half or the ventral cord. The main synaptic output of PQR is directed to AVA (r, g) and AVD (g), usually in dyadic combinations. There are also gap junctions to PVP (h) and there is some synaptic input from PVN (*c). Magnifications: (a-c, e, f) x 25500, (d) x 12750, (g, h) x 38250.

---

PQR VENTRAL CORD SYNAPSES

partners	gap junctions	synapses from	synapses to and corecipients
AVA	-	-	11AVD, 2AVA, LUA
AVD	-	-	11AVA, AVD, PVN
AVG	-	-	1
LUA	-	1m	AVA
PVN	-	3m	AVD
PVP	4	-	-

---

Web adaptation, Thomas Boulin, for Wormatlas, 2001, 2002. Updated by Laura A. Herndon, 2014.