Motor nerves of salivary myoepithelial cells in dogs.

1. The pressures in the ducts of the parotid and submaxillary glands were recorded in dogs under chloralose-urethane anaesthesia. A single stimulus applied to the parasympathetic nerve regularly caused a pressure rise of short duration. Usually it did not evoke secretion.2. In both glands a single stimulus applied to the vagosympathetic trunk usually caused a pressure response of short duration. It had no secretory effect.3. In the parotid gland, repetitive vagosympathetic stimulation caused a sustained increase of pressure in the duct, usually without inducing secretion.4. In the submaxillary gland, repetitive vagosympathetic stimulation caused a sustained pressure rise, even when the secretory response had been abolished by propranolol.5. It is concluded that the salivary myoepithelial cells of dogs are supplied with fibres from both sympathetic and parasympathetic divisions of the autonomic nervous system and both can cause the cells to contract.