DENT 5315/DH 2215       March 4, 2008
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DENT 5315/DH 2215 March 4, 2008. Here comes the Quiz!. Yes!. KEY. Temporomandibular Joint. Dr. Sandra Myers Director, NIDCR’s TIRR TMJ Implant Repository. N ational I nstitute of D ental and C raniofacial R esearch's T MJ I mplant R egistry and R epository. Splints.

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DENT 5315/DH 2215 March 4, 2008

Here comes

the Quiz!

Yes!



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Temporomandibular Joint

Dr. Sandra Myers

Director, NIDCR’s TIRR TMJ Implant Repository

National

Institute of

Dental and Craniofacial Research's

TMJ

Implant

Registry and Repository


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Splints

Patient slides deleted to protect patient identity.


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Temporomandibular Joint (TMJ)

Classification of Joints

Temporomandibular Joint


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I. Classification of Joints

3 Types of Joints:

  • Fibrous

  • Cartilaginous

  • Synovial



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II. Temporomandibular Joint (TMJ)

Type of Joint

Development

Anatomy & Histology

D. Biomechanics

E. Innervation

F. Blood Supply


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II. Temporomandibular Joint (TMJ)

Type of Joint

“synovial sliding-ginglymoid joint”

Ginglymoid means: Pertaining to, or resembling, a ginglymus, or hinge joint; ginglyform.


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II. Temporomandibular Joint (TMJ)

B. Development

Association of Meckel’s cartilage with mandible

Condylar cartilage appears 12th week



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Condylar Head

Bovine Condyle


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Condylar Head

A - Fibrous layer

B - Reserve zone

C - Proliferative zone

D - Hypertrophic zone

E - Calcifying zone

F - Bone


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Capsule

  • Functions:

  • Seals joint space

  • Passive stability

  • Synovial lining

  • Proprioceptive nerve endings

Note synovial membrane over villi (arrow):


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Articular Disk

“Acres of Collagen”

Aneural & Avascular



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Synovial Membrane

  • Synovial Fluid:

  • Liquid environment

  • Lubrication

  • Nutrition?


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Muscles

Muscles of Mastication

Difference between unipennate, bipennate & multipennate:

Muscles with central tendon

Muscle fiber bundles attached to one side, two sides or around multiple central tendons


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D. Biomechanics

Complex combinations of muscle activity

Disk enables complex movements


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D. Innervation

Movements of synovial joint initiated & effected by muscle coordination.

Achieved in part through sensory innervation.

Hilton’s Law:

The muscles acting on a joint have the samenerve supply as the joint.

Therefore: Branches of the mandibular division of the fifth cranial nerve supply the TMJ (auriculotemporal, deep temporal, and masseteric)


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D. Innervation

4 Types of nerve endings:

1. Ruffini’s corpuscles (limited to capsule)

2. Pacini’s corpuscles (limited to capsule)

3. Golgi tendon organs (confined to ligament)

4. Free nerve endings (most abundant)


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Pacinian Corpuscle

“Onion-like encapusulated pressure receptors

Surrounding concentric lamellae respond to distortion, generate action potential in unmyelinated fiber in core

Bar = 100 microns

http://www.kumc.edu/instruction/medicine/anatomy/histoweb/nervous/nervous.htm


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Ruffini’s & Golgi Corpuscle

Function: Ruffini’s = Posture (proprioception), dynamic and static balance

Golgi tendon organ = Static mechanoreception, protection (ligament)

Free nerve endings = Pain (nociception) protection (joint)

Ruffini’s Corpuscle

www.anatomyatlases.org/ MicroscopicAnatomy/Section06/Section06.shtml


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