Fig. 3.

Contacts on commissural interneuron (CINs) from descending systems. A: commissural interneuron in lamina VIII (green) of the rat cervical spinal cord. Red structures are terminals of reticulospinal (RS) neurons. The area within the box is shown at a larger magnification in the series of images on the right. A1 shows the dendrite of the cell. A2 shows RF terminals. A3 shows immunoreactivity for the vesicular glutamate transporter 2. A4 is a merged image showing that several glutamatergic RF terminals contact the dendrite (arrows). Adapted from Mitchell et al. (2016). Scale bars A = 20 µm; A1–A4 = 5 µm. B: a dendrite of a lamina VIII commissural cell injected with Neurobiotin in the cat lumbar cord (blue). Red structures are serotonin-immunoreactive terminals and green terminals are dopamine-β hydroxylase immunoreactive; a marker for noradrenergic terminals. Several serotonin terminals make contacts with the dendrite (B1 and B2). From Hammar et al. (2004). Scale bars: B = 5 µm; B1 and B2 = 2.5 µm.