Masseter muscle is partly concealed, anteriorly, by the superficial portion. Posteriorly, it is covered by the parotid gland. Along with the other three muscles of mastication (temporalis, medial pterygoid, and lateral pterygoid), the masseter is innervated by the anterior division of the mandibular division (V3) of the trigeminal nerve. The innervation pathway is: gyrus precentralis > genu capsula interna > nucleus motorius nervi trigemini > nervus trigeminus > nervus mandibularis > musculus masseter. The action of the muscle during bilateral contraction of the entire muscle is to elevate the mandible, raising the lower jaw. Elevation of the mandible occurs during the closing
What Hurts the Most hip-swiveling chorus after a flurry of robotic drum beats is certainly a good giggle." Kurt Kirton of About.com named it one of the album's standout tracks. Chuck Taylor of "Billboard" gave "What Hurts the Most" a positive review, writing that "this track is remixed into a frothy uptempo anthem, complete with requisite percussive thump and an exulted vocal (with 12 mixes in all) that leaves the lyric's potential heartbreak in the dust." Taylor ended his review, asking "Wouldn't it be wondrous if American programmers renewed their vow in 2008 to put variety on the airwaves—or do we really need a