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SNc (Substantia nigra, compact part) projects to PAG (Periaqueductal gray)

All claims for this connection
Species
Rat
Result
present
Method
retrograde tracer
Sign
unknown
Strength
weak
Evidence
Very few CTb/TH double-labelled cells appeared in A9 (substantia nigra), and only in two cases whose injections spread into the intermediate-caudal dlPAG and the superior colliculus.
Source

A discrete dopaminergic projection from the incertohypothalamic A13 cell group to the dorsolateral periaqueductal gray in rat

Frontiers in Neuroanatomy, 2013

DOI 10.3389/fnana.2013.00041 · PubMed 24367297 · PMC3853869, Results, Other cell groups; Table 1
Named in the paper
“A9 (substantia nigra)” and “dlPAG”
Made by
an AI model reading the paper (claude-opus-5-5, extract@0.3.0), 2026-10-10
Checked by

a second AI model (claude-opus-5-5) agrees, 2026-10-10

“Very few double-labelled cells were seen in A9, only in R23 and R26, whose injections spread into the intermediate-caudal dlPAG and SC.”

Status

proposed

Drafted and checked by AI models; it stays proposed until people have audited a sample of such claims.