Masticatory Muscles OIA

Temporal m.: Origin

temporal fossa

Temporal m.: Insertion

cornoid process of the mandible

Temporal m.: Action

Raise the mandible when closing the mouth

Masseter m. (superficial, middle, and deep parts): Origin

Zygomatic arch, deeper portion fuses with temporal m.

Masseter m. (superficial, middle, and deep parts): Insert

Masseteric fossa of the mandible

Masseter m. (superficial, middle, and deep parts): Action

Raise the mandible when closing the mouth

Medial pterygoid m.: Origin

Pterygoid, palantine and sphenoid bones

Medial pterygoid m.: Insertion

Caudomedial margin of the mandible

Medial pterygoid m.: Action

Raise the mandible

Lateral pterygoid m.: Origin

Sphenoid bone

Lateral pterygoid m.: Insertion

Condyle of the mandible

Lateral pterygoid m.: Action

Raise the mandible

Digastricus m. (rostral and caudal bellies): Origin

jugular process of the occipital bone

Digastricus m. (rostral and caudal bellies): Insertion

Ventral border and angular process of the mandible

Digastricus m. (rostral and caudal bellies): Action

Open the mouth