Muscles of Mastication & Buccolabial Flashcards
Origin of Masseter
Zygomatic arch
Zygomatic bone
Insertion of Massester
Lateral surface of the ramus and angle of the mandible
Action of Massester
Elevates mandible
Origin of Lateral Pterygoid
Superior head: Greater wing of sphenoid bone
Inferior head: lateral surface of the lateral pterygoid plate
Insertion of Lateral Pterygoid
Superior head: Capsule and articular disk of the TMJ
Inferior head: Neck of mandible
Action of Lateral Pterygoid
Protract mandible
Opens mouth
Active in grinding actions of chewing
Origin of Medial Pterygoid
Medial surface of the lateral pterygoid plate
Pyramidal process of the palatine bone
Tuberosity of the maxilla
Insertion of Medial Pterygoid
Medial surface of the ramus and angle of the mandible
Action of Medial Pterygoid
Elevates and protracts the mandible
Origin of Temporalis
Temporal fossa and temporal fascia
Insertion of Temporalis
Coronoid process of mandible &
Anterior surface of the ramus of the mandible
Action of Temporalis
Elevates the mandible
Posterior fibers retract the mandible
Origin of Buccinator
Pterygomandibular raphe
Mandible
Maxilla lateral to the molar teeth
Insertion of Buccinator
Angle of mouth, & lateral portion of upper and lower lips
Action of Buccinator
Pull the corner of the mouth laterally ; presses cheek against teeth
Origin of Depressor Anguli Oris
Oblique line of the mandible
Insertion of Depressor Anguli Oris
Angle of the mouth
Action of Depressor Anguli Oris
Pulls corner of mouth downward
Origin of Depressor Labii Inferioris
Anterior surface of mandible
Insertion of Depressor Labii Inferioris
Skin of lower lip
Action of Depressor Labii Inferioris
Depresses lower lip
Origin of Levator Anguli Oris
Canine fossa of the maxilla
Insertion of Levator Anguli Oris
Angle (corner) of mouth
Action of Levator Anguli Oris
Elevates the angle of the mouth
Origin of Levator Labii Superioris
Inferior margin of the orbit
Insertion of Levator Labii Superioris
Skin of upper lip
Action of Levator Labii Superioris
Elevates the upper lip
Origin of Levator Labii Superioris Alaeque Nasi
Frontal process of maxilla
Insertion of Levator Labii Superior Alaeque Nasi
Ala of the nose and skin of the upper lip
Action of Levator Labii Superior Alaeque Nasi
Elevates the upper lip and flares the nostril
Origin of Mentalis
Anterior surface of the mandible near the mental symphysis (midline)
Insertion of Mentalis
Skin of the chin
Action of Mentalis
Elevates the lower lip and skin of chin
Origin of Orbicularis Oris
Skin and fascia of lips and the area surrounding the lips
Insertion of Orbicularis Oris
Skin and fascia of the lips
Action of Orbicularis Oris
Purses the lips
Origin of Risorius
Fascia of the lateral cheek
Insertion of Risorius
Skin of the angle (corner) of the mouth
Action of Risorius
Draws the corner of the mouth lateraly
Origin of Zygomaticus Major
Upper lateral surface of the zygomatic bone
Insertion of Zygomaticus Major
Skin of the angle of the mouth
Action of Zygomaticus Major
Elevates and draws the corner of the mouth laterally
Origin of Zygomaticus Minor
Lower surface of zygomatic bone
Insertion of Zygomaticus Minor
Lateral part of upper lip
Action of Zygomaticus Minor
Elevates upper lip