Neuronal subpopulations in cat retina which accumulate the GABA agonist, (3H)muscimol: A combined Golgi and autoradiographic study

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Abstract
Golgi impregnation techniques were combined with, electron microscopic autoradiography of (3H)muscimol in order to provide morphological identification of labeled neurons in the cat retina. This γ-aminobutyric acid (GABA) agonist has been shown to label the same neurons which accumulate (3H)GABA. Selected cells were photographed and drawn by the aid of a camera lucida drawing tube prior to being thin sectioned for autoradiography. The (3H)muscimol-accumulating neurons which were identified include an interplexiform cell, five classes of conventional amacrine cell, and another cell with its soma located in the ganglion cell layer which is either a ganglion cell or a displaced amacrine. The conventional amacrine cells were compared with the recent morphological classification of Kolb et al. (Vision Res. 21: 1081-1114, '81) and identified as A2, A10, A13, A17, and A19 amacrine cells. These cells exhibit a widespread distribution providing input to all five strata of the inner plexiform layer.

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