1. A quantitative electron microscopic immunocytochemical technique was used to assess the number of synapses immunoreactive for tyrosine hydroxylase (TH), phenylethanolamine N‐methyltransferase (PNMT) and neuropeptide Y (NPY) in the intermediolateral cell column in segments T2 and T3 of rat thoracic spinal cord. 2. TH synapses comprised about 5%; PNMT synapses 1–2%; and NPY synapses 1–2% of the total number of synapses in the intermediolateral cell column. All three types of synapses were predominantly or exclusively on dendrites. 3. Our results suggest that catecholamine/NPY neurons may not provide a major synaptic input to sympathetic preganglionic neurons in rat upper thoracic spinal cord.
|Number of pages||5|
|Journal||Clinical and Experimental Pharmacology and Physiology|
|Publication status||Published - 1991|
- neuropeptide Y
- phenylethanolamine N‐methyltransferase
- sympathetic preganglionic neurons
- tyrosine hydroxylase