The<unk><unk>  (or internal<unk>  muscle), is a thick, quadrilateral muscle of mastication.
The mandibular branch of the fifth cranial nerve, the trigeminal nerve, innervates the<unk> .
Medial pterygoid muscle
Occipitofrontalis muscle
Temporalis muscle
Palatoglossus muscle
Lateral rectus muscle
Geniohyoid muscle
Sternohyoid muscle
Levator palpebrae superioris muscle