Table 1

Designation of serotonergic cell groups in the raphe nuclei and brainstem reticular formation and the corresponding classification into the B groups

Cytoarchitectonic Structure Containing 5-HT NeuronsB Group Classification
MRN, caudal partB5 *
MRN, rostral main partB8 *
DRN, caudal partB6
DRN principal, rostral partB7 *
CLNB8
Nucleus pontis oralisB8/B9 *
Supralemniscal regionB9
  • The structures marked ∗ form part of the nucleus centralis superior as defined by Olszeswki and Baxter in 1954. Table modified from Törk, 1990.