The Control of Salivary Secretion 



Fig. 12. i. Diagrammatic representation of results obtained upon stimulation 

 of the medulla of 35 cats. 



The sections are about 1 mm apart. Each large solid circle or triangle represents a response of 

 salivary flow at a rate of more than 0-25 c.c. per min, and each small solid circle or triangle, at 

 a rate of 01 c.c. to 0-25 c.c. per min. Secretion of less than 01 c.c. per min is not represented. 

 Circles indicate responses from the right submaxillary gland, and triangles, responses from the 

 right parotid gland but transposed to the opposite side. Abbreviations are: BC — brachium con- 

 junctivum; CS — cortico-spinal tract; DVN — dorsal or medial vestibular nucleus: Z) IT?— de- 

 scending vestibular root: F — medial longitudinal fasciculus; IO — inferior olive; .R— restiform 

 body; S — solitarv fasciculus; SO — superior olive; SV— spinal tract of the trigeminal nerve; 

 7Y— trapezoid body; VCN — ventral cochlear nucleus; VN — spinal nucleus of the trigeminal 

 nerve; VI — abducens nerve; VII — facial nerve: VIIN — facial nucleus (Wang, 1943)- 



close to it caused a contracture, and vasodilatation in the tongue 

 as well as salivary secretion. Vascular responses in the submaxillary 

 gland were not studied, but the observations seem to suggest that 

 the secretory and vasodilator mechanisms of the glands are closely 

 connected and difficult to separate, at least at the medullary level. 

 On stimulation of the salivary nuclei, predominantly ipsilateral 

 responses were obtained, and these were ascribed to the activation 

 of salivary motor nuclei and their efferent root fibres. The centres 

 seem to innervate mainly the glands of the same side. Sometimes, 

 however, bilateral effects were elicited; they were supposed to be 



