Facial nerve stimulation during testing of nerve indicated by contraction of which muscle?
Facial nerve supplies the muscles of the facial expression like orbicularis oris. 
Muscles of mastication like masseter and temporalis are supplied by the mandibular nerve, a branch of trigeminal nerve.
Spinal accessory nerve supplies sternocleidomastoid and the trapezius.
Temporalis
Masseter
Sternocleidomastoid
Orbicularis oris