PSI [FBbt_00007408]

Neuron with its soma located anteriorly and laterally in the rind region of the mesothoracic neuromere (Phelps et al., 2021). It crosses the midline and connects via gap junctions to the giant fiber neuron at the inframedial bridge (Allen et al., 1998). It fasciculates with the posterior dorsal mesothoracic nerve, but terminates within the nerve (King and Wyman, 1980). It synapses onto neighboring motor neurons in this nerve and, unusually, these motor neurons also synapse back onto the PSI (Phelps et al., 2021). There is one of these neurons per hemisphere (Phelps et al., 2021).
Tags:
PSI PSI PSI PSI

PSI

ID: FBbt_00007408

Adult Nervous system Neuron

Neuron with its soma located anteriorly and laterally in the rind region of the mesothoracic neuromere (Phelps et al., 2021). It crosses the midline and connects via gap junctions to the giant fiber neuron at the inframedial bridge (Allen et al., 1998). It fasciculates with the posterior dorsal mesothoracic nerve, but terminates within the nerve (King and Wyman, 1980). It synapses onto neighboring motor neurons in this nerve and, unusually, these motor neurons also synapse back onto the PSI (Phelps et al., 2021). There is one of these neurons per hemisphere (Phelps et al., 2021).

Open in VFB 3D Browser →
## Classification

Relationships

Alternative Names

Synonym Scope Reference
PSI exact synonym Phelps et al., 2021
PSI exact synonym Berg et al., 2025
PSI exact synonym Bates et al., 2025
PSI exact synonym doi_10_7554_eLife_97766_1
PSI neuron exact synonym King and Wyman, 1980
PSI exact synonym