Muscles of mastication Flashcards
Origin of m. masseter
Superficial part - ventral surface of the rostral half of the zygomatic arch.
Deep part - ventral surface of the caudal half of the zygomatic arch.
Insertion of m. masseter
Fossa massetica of the mandible and lateral surface of the process oronoideus
Function of m. masseter
Closure of mouth by raising the mandible
Origin of m. temporalis
Parietal (mainly), frontal and temporal bones.
The area of attachment is bounded by the external saggital crest, orbital ligament, zygomatic arch and nuchal crest.
Insertion of m. temporalis
Process coronoideus - medial surface: entire process; lateral surface: dorsal and rostral edges, to the ventral aspect of the masseteric fossa.
Function of m. temporalis
Closure of the mouth by raising the mandible.
Origin of m. digastricus
process paracondylaris
Insertion of m. digastricus
Caudo-ventral aspect of the mandible. The insertion is fleshy.
Function of m. digastricus
Opening of the mouth by retracting the mandible
Origin of m. pterygoideus medialis
Perpendicular palatine bone (mainly), the wing of the basisphenoid bone and the pterygoid bone.
Insertion of m. pterygoideus medialis
Process angularis, both laterally and medially
Function of m. pterygoideus medialis
Closure of the mouth by raising the mandible
Origin of m. pterygoideus lateralis
Perpendicular palatine bone and the wing of the basisphenoid bone, immediately ventral to the orbital fissure and alar canal.
The origin lies dorso-caudal to that of the medial pterygoid muscle.
Insertion of m. pterygoideus lateralis
Fovea pterygoidea, on the medial surface of the proc. condylaris, just ventral to the articular surface.
Function of m. pterygoideus lateralis
Closure of the mouth by raising the mandible
