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AVF is a pair of interneurons with bipolar cell bodies situated in the retro-vesicular ganglion.
Anteriorly directed processes leave the cell bodies and run together round the left side of the
excretory duct and then enter the nerve ring. They run right round the nerve ring on a
trajectory which is near the inside and posterior surfaces of the neuropile, eventually ending
ventrally. The posteriorly directed processes from the cell bodies of AVF run together in the
dorsal regions of the ventral cord and end in the pre-anal ganglion. The processes of AVFL and AVFR are at all times closely associated. AVF makes a few rather small synapses, although
in the nerve ring there are several regions that have vesicle-filled varicosities with no associated
synaptic contacts (b). The main synaptic output in the nerve ring is to AVB (a) , HSN (a) and AVJ; the main synaptic input is from AIM and HSN (*c). In the ventral cord there are
chemical synapses to and from AVH (c and *d) as well as several gap junctions. There are
also a few synapses to AVB (c) and several other synapses including a couple of small NMJs
(d) and a few synapses with no obvious postsynaptic partner. There are many rather small
gap junctions between AVFL and AVFR along the length of the cord.
Magnifications: (a) x 25500, (b) x 12750, (c, d) x 17000.
AVF ventral cord synapses
partners |
gap junctions |
synapses from |
synapses to and corecipients |
AVH |
8 |
6m |
1, AVL, AVF, AVB, AVJ |
AVB |
- |
- |
1, AVG, AVJ, AVH |
AVF |
21 |
1+2m |
1, PVT, AVH |
AVJ |
1 |
1m |
1, AVB, AVH |
NMJ |
- |
- |
2 |
AVG |
- |
- |
1, AVB |
PVQ |
- |
- |
PDE |
PDE |
- |
- |
PVQ |
AVL |
- |
1m |
AVH |
VD11 |
- |
- |
1 |
PHA |
- |
3m |
- |
VC5 |
- |
1+1m |
- |
PHB |
- |
1m |
- |
VC4 |
2 |
- |
- |
|
|
