Muscles of mastication_2 /certified fixed orthodontic courses by Indian dental academy

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Dental Courses by Indian Dental Academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.

Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078

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Muscles of mastication_2 /certified fixed orthodontic courses by Indian dental academy

  1. 1. www.indiandentalacademy.com Muscles Of Mastication INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com
  2. 2. www.indiandentalacademy.com Introduction  Muscles of mastication develop from the mesoderm of the first pharyngeal arch.  They are innervated by the Mandibular division of the trigeminal nerve.
  3. 3. www.indiandentalacademy.com Description  They are functionally classified as: – Jaw elevators: • Masseter • Temporalis • Medial pterygoid • Upper head of lateral pterygoid – Jaw depressors • Lower head of lateral pterygoid • Anterior digastric • Geniohyoid • Mylohyoid
  4. 4. www.indiandentalacademy.com Other related Muscles.  Orbicularis oris anterior oral seal  Buccinator and Tounge Help to keep the bolus of food on the occ. Surface of teeth
  5. 5. www.indiandentalacademy.com Masseter  It has 3 layers:  Superficial layer: – Origin: lower border of the zyg.arch(ant 2/3) – Insertion: lateral surface of the ramus
  6. 6. www.indiandentalacademy.com Masseter - Cont.  Middle layer: – Origin: Medial surface of the anterior 2/3 Lower border of the posterior 1/3 of zyg arch. – Insertion: lateral surface of the ramus
  7. 7. www.indiandentalacademy.com Masseter - Cont.  Deep layer: – Origin: Medial surface of zygomatic arch – Insretion: upper part of the ramus
  8. 8. www.indiandentalacademy.com Masseter  Action: – Elevation (deep fibers) – Protraction (superficial fibers)  Nerve supply: – Anterior division of mandibular nerve (masseteric nerve)  Blood supply: – Transverse facial artery
  9. 9. www.indiandentalacademy.com Temporalis  Has 2 heads: – Deep head (anterior, middle and posterioe fibers) – Superficial head (much smaller)
  10. 10. www.indiandentalacademy.com Temporalis  Origin: Temporal fossa, Temporal fascia – In an area bound by the inferior temporal line above and the infra temporal crest below  Insertion: – Cronoid process in its medial aspect (apex, anterior and posterior border) – Anterior border of the ramus.
  11. 11. www.indiandentalacademy.com Temporalis  Action: – Elevation (anterior fibers) – Protraction (posterioe fibers)  Nerve supply: – Anterior division of the mandibular nerve (2 deep temporal nerves)
  12. 12. www.indiandentalacademy.com Lateral Pterygoid  Has 2 heads:  Upper head: – Origin: infratemporal surface & crest of the greater wing of sphenoid – Insertion: enters the TMJ & inserted into: a) ptrygoid fovea of the neck of the mandible b) articular disc c) capsule of TMJ (anterior aspect)
  13. 13. www.indiandentalacademy.com Lateral pterygoid cont.  Lower head: – Origin: Lateral surface of the lateral pterygoid plate – Insertion: as upper head
  14. 14. www.indiandentalacademy.com Lateral Pterygoid cont.  Action: 1. Both muscles produce depression of the mandible. 2. Lat. & Med pterygoid on 1 side protrude the mandible to the opposite side. 3. Lat & Med pterygoid on the 2 sides cause side to side movement
  15. 15. www.indiandentalacademy.com Lateral ptrygoid cont.  Nerve supply: Anterior division of mandibular nerve (nerve to lateral pterygoid)
  16. 16. www.indiandentalacademy.com Medial pterygoid  Has 2 heads  Superficial head: – Origin: a) maxillary tuberosity b) neighboring part of palatine bone. _ Insertion: Medial surface of the angle & ramus below the mandibular foramen.
  17. 17. www.indiandentalacademy.com Medial Pterygoid (sup. head)
  18. 18. www.indiandentalacademy.com Medial pterygoid cont.  Deep head: – Origin: Medial surface of the lateral pterygoid plate. – Insertion: as upper head.  Action: 1) both muscles elevate the mandible. 2 & 3 as in lateral pterygoid.  Nerve supply: Trunk of the mandibular nerve (nerve to medial pterygoid muscle)
  19. 19. www.indiandentalacademy.com Medial Pterygoid (deep head)
  20. 20. www.indiandentalacademy.com Thank You

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