The masseter is a muscle of mastication (chewing). It is quadrangular in shape and has two parts – deep and superficial.
- The superficial part originates from maxillary process of the zygomatic bone.
- The deep part originates from the zygomatic arch of the temporal bone.
- Both parts attach to the ramus of the mandible.
- Actions: Elevation of the mandible (closes the mouth).
- Innervation: Mandibular nerve (V3).
- Blood Supply: Masseteric artery (branch of maxillary artery).