[The structural correlations in the presynaptic terminals from the dorsal horn of the spinal cord]

The summarized data on three-dimensional parameters of ultrastructural elements of presynaptic terminals (PTs) in the dorsal horn of the cat spinal cord are presented. Interrelations of the following parameters were studied: mean volume and plasma membrane surface area of PTs; mean volume, surface area and number of mitochondria in the PTs; mean area and the number of active zones, mean number of synaptic vesicles per each observed PT. The data obtained were regarded as parameters reflecting the features of ion diffusion, transmitter release and vesicular recycling in PTs.