which type of innervation causes pupil dilation
Trauma. A dilated pupil may be caused by any kind of trauma such as a damage of the nerves controlling the activities of the iris, an injury to the head or the eye, and iris sphincter. All these factors highly affect the consensual reactivity of the eyes to light and cause fixed and dilated pupils after trauma.ervous Problems. The neuropathic cause behind dilation of the pupils is the sympathetic stimulation of Î±1 adrenergic receptors involving the radial muscle and the parasympathetic stimulation involving the circular iris muscle cause the pupils to dilate.