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Muscles acting on Mandible/TMJ (Suprahyoid mms (Stylohyoid (O: styloid…
Muscles acting on Mandible/TMJ
Suprahyoid mms
Stylohyoid
O: styloid process
I: hyoid bone
facial n
depresses mandible against resistance when infrahyoid muscles fix or depress hyoid bone
Mylohyoid
O: medial body of mandible
I: hyoid bone
mandibular n
depresses mandible against resistance when infrahyoid muscles fix or depress hyoid bone
Digastric
O: base of cranium
I: hyoid bone
facial & mandibular n
depresses mandible against resistance when infrahyoid muscles fix or depress hyoid bone
Geniohyoid
O: anterior body of mandible
I: hyoid bone
n. to geniohyoid (C1-C2)
depresses mandible against resistance when infrahyoid muscles fix or depress hyoid bone
MMs of facial expression
Platysma
O: Subcutaneous tissue of infraclavicular & supraclavicular regions
I: Base of mandiple, skin of cheek & lower lip, angle of mouth, & orbicularis oris
Cervical branch of facial n
Depresses mandible against resistance
Infrahyoid mms
Sternohyoid
O: Manubrium of sternum
I: Hyoid bone
Ansa cervicalis (C1-C3)
Fixes or depresses hyoid bone
Sternothyroid
O: Manubrium of sternum
I: Thyroid cartilage
Ansa cervicalis (C1-C3)
Fixes or depresses hyoid bone
Omohyoid
O: Scapula
I: Hyoid bone
Ansa cervicalis (C1-C3)
Fixes or depresses hyoid bone
Thyrohyoid
O: Thyroid cartilage
I: Hyoid bone
C1 via hypoglossal n - CN XII
Fixes or depresses hyoid bone
Muscles of mastication
Lateral Pterygoid
O: 1) infratemporal surface & crest of greater wing of sphenoid 2) lateral surface of lateral pterygoid plate
I: 1) joint capule & articular disc of TMJ 2) pterygoid fovea of condyloid process of mandible
Anterior trunk of mandibular via lateral pterygoid n
bilaterally: protracts & depresses chin
unilaterally: swings haw toward contralateral side
Medial Pterygoid
O: 1) medial surface of lateral pterygoid plate & pyramidal process of palatine bone 2) tuberosity of maxilla
I: medial surface of ramus of mandible inferior to mandibular foramen
Anterior trunk of mandibular n via medial pterygoid n
synergistically with masseter to elevate mandible, protrusion
unilaterally: smaller grinding movement
Masseter
O: Inferior border & medial surface of maxillary process of zygomatic bone & zygomatic arch
I: Angle & lateral surface of ramus of mandible
Anterior trunk of mandibular n via masseteric n
elevated mandible, limited protusion
Temporalis
O: floor of temporal fossa & deep surface of temporal fascia
I: Tip & medial surface of coronoid process & anterior border of ramus of mandible
Anterior trunk of mandibular n via deep temporal branches
elevated mandible, retractors