310 Ss. W. RANSON 
Postganglionic neurones. Cells in the superior cer- 
vical ganglion, fibers by way of the internal carotid 
plexus to the ophthalmic division of the Vth nerve, 
the nasociliary and long ciliary nerves to the eyeball: 
other fibers pass from the internal carotid plexus through 
the ciliary ganglion, without interruption, into the short 
ciliary nerves and to the eyeball. 
Function—dilation of the pupil by the radial muscle 
fibers of the iris. 
2. Paths for the efferent innervation of the submaxillary gland. 
a. Submaxillary craniosacral pathway. 
Preganglionic neurones. Cells in the nucleus. sali- 
vatorius superior, fibers by way of the seventh cranial 
nerve, chorda tympani and lingual nerve to end in the 
submaxillary ganglion on the submaxillary duct. 
Postganglionic neurones. Cells in a number of groups 
along the chorda tympani fibers as they follow the sub- 
maxillary duct, fibers distributed in branches to the sub- 
maxillary gland. 
Function—increases secretion. 
b. Submaxillary thoracicolumbar pathway. 
Preganglionic neurones. Cells in the intermedio- 
lateral column of the spinal cord, fibers by way of the 
upper white rami, and the sympathetic trunk to end in 
the superior cervical ganglion. 
Postganglionic neurones Cells in the superior cer- 
vical ganglion, fibers by way of the plexuses on the ex- 
ternal carotid and external maxillary arteries to the 
submaxillary gland. 
Function—increases secretion. 
3. Paths for the efferent innervation of the heart. 
a. Cardiac craniosacral pathway. 
Preganglionic neurones. Cells in the dorsal motor 
nucleus of the vagus, fibers through the vagus nerve to 
the intrinsic ganglia of the heart in which they end. 
Postganglionic neurones. Cells in the intrinsic cardiac 
ganglia, fibers to the cardiac muscle. 
Function—cardiac inhibition. 
