Loss of lacrimation occurs due to injury of
Parasympathetic secretomotor nerve fibres destined for the lacrimal gland arise from the lacrimal nucleus of the facial nerve. They travel via the great petrosal nerve to reach the lacrimal gland. Consequently injuries of the greater petrosal nerve can cause loss of lacrimation.
Nasocilliary nerve
Greater petrosal nerve
Anterior ethmoidal nerve
Supraorbital nerve