Which of the following muscles is not innervated by the trigeminal nerve?
ExplanationC. The trigeminal nerve innervates the anterior belly of the digastric, whereas the posterior belly is innervated by the facial nerve. The tensor tympani is innervated by the trigeminal nerve and not the facial nerve. The only muscle innervated by the glossopharyngeal nerve is the stylopharyngeus muscle. The muscles innervated by the trigeminal nerve are medial and lateral pterygoids, masseter, deep temporal, anterior belly of the digastric, mylohyoid, tensor veli palatini, and tensor tympani. The muscles innervated by the facial nerve are stapedius, posterior belly of the digastric, stylohyoid, frontalis, occipitalis, orbicularis oculi, corrugator supercilii, procerus, buccinator, orbicularis oris, nasalis, levator labii superioris, alaeque nasi, zygomaticus major and minor, levator anguli oris, mentalis, depressor anguli oris, depressor labii inferioris, risorius, and platysma.
