tmj
DESCRIPTION
about tmj that will help uTRANSCRIPT
DENT 5315/DH 2215 March 4, 2008
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KEY
Temporomandibular Joint
Dr. Sandra Myers
Director, NIDCR’s TIRR TMJ Implant Repository
NationalInstitute of Dental and Craniofacial Research'sTMJ Implant Registry and Repository
Splints
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Temporomandibular Joint (TMJ)
I. Classification of Joints
II. Temporomandibular Joint
I. Classification of Joints
3 Types of Joints:
A. Fibrous
B. Cartilaginous
C. Synovial
I. Classification of Joints
II. Temporomandibular Joint (TMJ)
A. Type of Joint
B. Development
C. Anatomy & Histology
D. Biomechanics
E. Innervation
F. Blood Supply
II. Temporomandibular Joint (TMJ)
A. Type of Joint
“synovial sliding-ginglymoid joint”
Ginglymoid means: Pertaining to, or resembling, a ginglymus, or hinge joint; ginglyform.
II. Temporomandibular Joint (TMJ)
B. Development
Association of Meckel’s cartilage with mandible
Condylar cartilage appears 12th week
II. Temporomandibular Joint (TMJ)
C. Anatomy & Histology
Condylar Head
Bovine Condyle
Condylar Head
A - Fibrous layer
B - Reserve zone
C - Proliferative zone
D - Hypertrophic zone
E - Calcifying zone
F - Bone
Capsule
Functions:
Seals joint space
Passive stability
Synovial lining
Proprioceptive nerve endings
Note synovial membrane over villi (arrow):
Articular Disk
“Acres of Collagen”
Aneural & Avascular
Posterior Ligament
Synovial Membrane
Synovial Fluid:Liquid environment
Lubrication
Nutrition?
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
Complex combinations of muscle activity
Disk enables complex movements
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 same nerve supply as the joint.
Therefore: Branches of the mandibular division of the fifth cranial nerve supply the TMJ (auriculotemporal, deep temporal, and masseteric)
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
http://www.kumc.edu/instruction/medicine/anatomy/histoweb/nervous/nervous.htm
“Onion-like encapusulated pressure receptors
Surrounding concentric lamellae respond to distortion, generate action potential in unmyelinated fiber in core
Bar = 100 microns
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)
www.anatomyatlases.org/ MicroscopicAnatomy/Section06/Section06.shtml
Ruffini’s Corpuscle