Mastication

Mastication

Able to apply strong forces and yet able to to control fine detail, whistle, speech etc.
Componants of Mastication
1. Dentitions
  1. Periodontal tissues
    1. Maxilla/Mandible
      1. TMJ
        Mandibular muscles
        Muscles of lips/cheek/tounge
        soft tissues
        Innervation/Vascultaion
2. Muscles of Mastication
  1. Temprolalis
    1. O-Temporal
      1. I-corinoid process
        Elevates, retracts
  2. Masseter
    1. O-Zygomatic Arch
      1. I Angle of Mandible
        Elevation
  3. Lateral Pterygoid
    1. O-Lateral surface of Ptyrigoid plate
      1. I-Capsule of TMJ+Neck of Mandible
        Protrution/side to side
  4. Medial Pterygoid
    1. O-Medial surface of Lateral Ptyrigoid
      1. Medial surface near angle
        Elevation/Side to side
3. Non Masticatory muscle
  1. Digastric
  2. Mylohoid
  3. Geniohyoid
  4. Obicularis Oris
Development
1. Not born with it
3 Classes of Movement
1. Voluntary
  1. Speech
2. Reflex
  1. Swallowing
3. Cyclical
  1. Chewing
Factors determining Mastication
1. Teeth
2. Bite force
3. Neuromuscular control
4. Saliva
5. Taste/Texture food
6. Interplay with tounge and cheek
Stretch Reflex
1. Primary
  1. Sensitive to minute changes
2. Secondary
  1. Continuos info on muscle length
3. Keeps mouth closed/in rest and firm
  1. 3-8mm apart
Mechanisims involved
1. Muscle spindle receptors
  1. Sensory Neurons
2. Mechanoreceptors
  1. Must detect hard/soft food

Resource summary

	Created by Caroline Oxford almost 11 years ago