Temporalis origin
Temporal fossa and inferior temporal line
Temporalis insertion
Coronoid process mandible
Temporalis nerve supply
Anterior division Mandibular nerve
Temporalis action
- Elevation
- Retraction mandible
Sternomastoid origin
Medial 1/3 clavicle (Clavicular head) and manubrium sterni front (sternal head)
Sternomastoid insertion
Lateral surface mastoid process and superior nuchal line
Sternomastoid nerve supply
Spinal root accessory, C2 and 3
Sternomastoid action
- Bend head same side
- Rotates face opposite side (one)
- Neck flexion (both)
Masseter origin
Zygomatic arch
Masseter insertion
Outer surface of mandible ramus
Masseter nerve supply
Anterior division Mandibular nerve
Masseter action
- Elevation
- Protraction
Digastric origin
Digastric fossa mandible (anterior belly) and digastric notch mastoid (posterior belly)
Digastric insertion
Intermediate tendon
Digastric nerve supply
Nerve to mylohyoid (anterior belly) and facial nerve (posterior belly)
Digastric action
Hyoid elevation or mandible depression
