TMJ muscles Flashcards
Temporalis insertion
Coronoid, medial surface of ramus
Temporalis origin
Lateral skull/ temporal fossa
Temporalis action
Elevate mandible (close mouth)
Temporalis innervation
Mandibular branch of CN V
Masseter origin
Zygomatic bone and arch
Masseter insertion
Lateral surface of ramus and angle of mandible
Masseter action
elevate mandible (close mouth)
Masseter innervation
Mandibular branch of CN V
Medial pterygoid origin
Medial surface of lateral pterygoid plate
Medial pterygoid insertion
medial surface of ramus and angle
medial pterygoid action
elevate mandible (close mouth)
Medial pterygoid innervation
Mandibular branch of CN V
Lateral pterigoid superior head orign
greater wing of sphenoid
Leteral pterygoid superior head insertion
TMJ capsule and disc
Lateral pterygoid superior head action
retrusion (stabilizes disc)
Lateral pterygoid superior head innervation
Mandibular branch of CN V
Lateral pterygoid inferior head origin
lateral surface of lateral pterygoid plate
Lateral pterygoid inferior head insertion
Mandibular neck, just inferior to condyle
Lateral pterygoid inferior head action
protrusion
Lateral pterygoid inferior head innervation
mandibular branch of CN V
Diagastric muscle origin
Anterior- diagastric fossa of mandible
posterior- mastoid notch of temporal bone
Diagastric insertion
hyoid
Diagastric action
steadies hyoid bone
Diagastric innervation
Anterior- Mandibular branch of CN V
Posterior- Facial nerve (CN VII) (through mastoid foramen)
Suprahyoid origin
medial surface of mandible, inferior mental spines
Suprahyoid insertion
Superior surface of hyoid
Suprahyoid action
depresses mandible when hyoid is secured
Suprahyoid innervation
Mandibular branch of CN V, CN I
Infrahyoid origin
sternum, superior border of scapula, thyroid cartilage
Infrahyoid insertion
Inferior surface of hyoid and thyroid cartilage
infrahyoid action
depression/ fixation of hyoid
Infrahyoid innervation
C1-3, CN I
