1. Sympathetic innervation of eye (innervation of the pupillary dilator)
Nucleus of superior colliculus
Afferent impulse from retina
Postganglionic fibres passing via
plexus ophtalmicus
Efferent impulse via the posterior longitudinal fasciculus to the intermediolateral nuclei
Retina
Light rays
Superior cervical ganglion
Musculus
dilatator
pupillae
Middle cervical ganglion
Dilation of pupil
C 8
Impulse passing via the interganglionic fibres
Th 1
Stellate ganglion
Th 2
The second thoracic ganglion
Preganglionic fibres