The fine structure of the paracervical (Frankenhäuser) ganglion of the rat after permanganate fixation.

The fine structure of the paracervical ganglion was studied in the rat after 3 % KMnO4 fixation. Three types of neuronal cells were observed: (1) The majority of cells were devoid of dense-core vesicles (DCV). (2) The minority of cells with typical neuronal structure contained small (500 A) and large (1000 A) DCV. (3) The cells resembling those of the adrenal medulla contained vesicles up to 3000 A in diameter with irregular and dense core. The synaptic axon terminals to the different cell types contained agranular vesicles. Because no small DCVs were found, these synapses are presumably not adrenergic.

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