Morphology of two classes of target‐specific bullfrog sympathetic preganglionic neurons

These experiments took advantage of the unique ability to define target‐specific sympa‐thetic preganglionic neurons in the bullfrog spinal cord in order to examine the morphologies of different classes of preganglionic neurons. Sympathetic preganglionic neurons were identified by retrograde transport of fast blue from the sympathetic chain. Subsequently, fast blue‐labelled sympathetic preganglionic neurons in fixed spinal cord slices were filled with lucifer yellow and processed for visualization with lucifer yellow antiserum, biotinylated secondary antiserum, and avidin peroxidase. Target specificity of sympathetic preganglionic neurons was determined by anatomical position; sympathetic preganglionic neurons that control the vasculature (C‐type sympathetic preganglionic neurons) lie in a position caudal to those that control nonvascular targets [B‐type sympathetic preganglionic neurons; Horn and Stofer (1988) J. Comp. Neurol. 268:71].

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