NEUEO-MUSCULAK MECHANISM 



153 



middle region^of the spinal cord and pass through the lateral 

 ganglia of the sympathetic chain 



(1) Head and Neck. These leave the spinal cord by the 

 upper dorsal nerves and pass upwards in the sympathetic 

 cord of the neck to the superior cervical ganglion where they 



Head 



Thorax 



Abdomen 



Pelvis 

 FIG. 76. Scheme of distribution of Splanchnic Nerves. 



have their cell stations. From these, fibres are distributed 

 to the parts supplied. The chief functions of these fibres 

 are 1st. Vaso-constrictor to the vessels of the face and head ; 

 2nd. Pupilo-dilator (see p. 126); '3rd. Motor to the muscle of 

 Miiller; 4:th. Secretory to the salivary glands, lachrymal 



