Histochemical localization of adrenergic nerves in the guinea‐pig trachea

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Abstract
1 Specific catecholamine fluorescence was demonstrated in guinea-pig trachea in fine, varicose, nerve fibres running parallel to the tracheal smooth muscle fibres. 2 The density of nerves in tracheal smooth muscle was greater at the laryngeal end than at the bronchial end of the trachea. 3 The findings confirm pharmacological evidence for an adrenergic innervation of the guinea-pig isolated tracheal chain preparation.