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. 1999 Jan 1;19(1):391–400. doi: 10.1523/JNEUROSCI.19-01-00391.1999

Fig. 1.

Fig. 1.

Experimental setup and recordings. Schematic representation of the spinal cord pathways under study.Right, A stimulated muscle afferent contacts a short chain of two interneurons (PAD INs) responsible for PAD. The PAD is mediated by an axoaxonic synapse located at the terminal of a muscle afferent recorded with a micropipette. This pathway is stimulated, whereas the CPG for locomotion is activated.Left, Averaged PAD recorded intra-axonally in a FDHL group I fiber (Intra, black trace) evoked by a stimulation of PBSt (3 p, 5 T, 300 Hz) superimposed on the extra-cellular potential (Extra, gray trace) evoked by the same stimulation.