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ON THE REACTIONS OF THE SALIVARY CENTRES
Author(s) -
Miller F. R.
Publication year - 1913
Publication title -
quarterly journal of experimental physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 101
eISSN - 1469-445X
pISSN - 0370-2901
DOI - 10.1113/expphysiol.1913.sp000132
Subject(s) - reflex , stimulation , submandibular gland , parotid gland , medicine , digastric muscle , endocrinology , vagus nerve , chemistry , submaxillary gland , anatomy , pathology
I. The Lingualis Reflex. 1. Stimulation of the central end of the lingual nerve (lingualis reflex) causes abundant secretion from the ipsilateral submaxillary gland, and less secretion from the ipsilateral parotid. 2. Slight secretion (about one drop) takes place from the contralateral submaxillary and parotid glands. 3. The threshold of the reflex is very low (sec. coil at 30 cm.). 4. The threshold of the lingualis reflex is lower than that of the peripheral chordo‐lingual nerve. 5. The ipsilateral submaxillary latency is less than the parotid latency. The ipsilateral submaxillary latency is less than the contralateral submaxillary latency. II. The Glossopharyngeus Reflex. 1. Stimulation of the central end of the glossopharyngeal nerve (glossopharyngeus reflex) causes abundant secretion from the ipsilateral parotid gland, less secretion from the ipsilateral submaxillary. 2. Slight contralateral effects are produced. 3. The ipsilateral parotid latency is less than the submaxillary latency. III. The Gastric Vagus Reflex. 1. Stimulation of the central end of the gastric vagus (gastric vagus reflex) causes secretion from the submaxillary and parotid glands. 2. The threshold is high. IV. Stimulation of a sensory nerve (sciatic) causes a slight submaxillary secretion. V. The salivary reflexes are independent of the associated muscular reflexes. VI. Afferent fibres for the salivary reflex are contained in the chorda tympani. VII. The salivary secretion of curare poisoning is caused by asphyxia. VIII. Two points may be localised by unipolar faradisation of the surface of the medulla oblongata. Stimulation of the one causes parotid secretion; of the other, submaxillary secretion. The stimulus threshold is very low (sec. coil at 80 cm.). The results agree, in the main, with those of previous anatomical work. I take pleasure in thanking Professor Sherrington for advice and assistance during the course of this work. My best thanks are also due to Dr Potter of Amsterdam for aid in identifying certain of the structures in the sections.