Preganglionic parasympathetic fibres to parotid gland relay at

Sensory root by the auriculotemporal nerve. Sympathetic root is by the sympathetic plexus around middle meningeal aery. Secretomotor root is by the lesser petrosal nerve from the tympanic branch of cranial nerve IX. Motor root is by a branch from nerve to medial pterygoid. Ref BDC volume3,6th edition pg 311