Figure 6.
Ultrastructure of VAChT-IR profiles in lamina II of monkey spinal cord. A, In a parasagittal section, observe a VAChT-IR bouton (B) establishing a symmetric synapse with a dendrite (D) and apposed to an astrocytic process (G). B, C, The central boutons of type I glomeruli (CI) are postsynaptic to VAChT-IR profiles (B) and are also in apposition with unlabeled boutons displaying pleomorphic synaptic vesicles (V); the VAChT-IR profiles also contact glomerular dendrites (D). D, A VAChT-IR dendrite (*) is postsynaptic to the central bouton of a type I glomerulus (CI). Arrowheads indicate symmetric synapses, and arrows indicate asymmetric contacts. Scale bars, 0.5 μm.