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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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slide1

DENT 5315/DH 2215 March 4, 2008

Here comes

the Quiz!

Yes!

slide3

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

splints
Splints

Patient slides deleted to protect patient identity.

temporomandibular joint tmj
Temporomandibular Joint (TMJ)

Classification of Joints

Temporomandibular Joint

i classification of joints
I. Classification of Joints

3 Types of Joints:

  • Fibrous
  • Cartilaginous
  • Synovial
ii temporomandibular joint tmj
II. Temporomandibular Joint (TMJ)

Type of Joint

Development

Anatomy & Histology

D. Biomechanics

E. Innervation

F. Blood Supply

ii temporomandibular joint tmj9
II. Temporomandibular Joint (TMJ)

Type of Joint

“synovial sliding-ginglymoid joint”

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

ii temporomandibular joint tmj10
II. Temporomandibular Joint (TMJ)

B. Development

Association of Meckel’s cartilage with mandible

Condylar cartilage appears 12th week

condylar head
Condylar Head

Bovine Condyle

condylar head13
Condylar Head

A - Fibrous layer

B - Reserve zone

C - Proliferative zone

D - Hypertrophic zone

E - Calcifying zone

F - Bone

capsule
Capsule
  • Functions:
  • Seals joint space
  • Passive stability
  • Synovial lining
  • Proprioceptive nerve endings

Note synovial membrane over villi (arrow):

articular disk
Articular Disk

“Acres of Collagen”

Aneural & Avascular

synovial membrane
Synovial Membrane
  • Synovial Fluid:
  • Liquid environment
  • Lubrication
  • Nutrition?
muscles
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

d biomechanics
D. Biomechanics

Complex combinations of muscle activity

Disk enables complex movements

d innervation
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)

d innervation21
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)

pacinian corpuscle
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

ruffini s golgi corpuscle
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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