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What is The fifth nerve innervates the following: and explain in detail?
Trigeminal nerve is the 5th cranial nerve. It is a mixed nerve containing both the motor and sensory fibres but predominantly it is sensory.
It is a motor nerve to the muscles of mastication and several small muscles and the principal sensory nerve of the head and face.
It consists of three large nerves: ophthalmic, maxillary, and mandibular, hence the name trigeminal nerve (L. trigeminus = triplet).

Key concept:
Mandibular nerve supplies muscles of mastication mylohyoid, anterior belly of digastric, and tensor tympani.
Posterior belly of digastric and stapedius are supplied by Facial nerve.