Transcript Document

DENT 5315/DH 2215
Here comes
the Quiz!
Yes!
March 4, 2008
KEY
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
Patient slides deleted to
protect patient identity.
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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 slidingginglymoid 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
Difference
between
unipennate,
bipennate &
multipennate:
Muscles with
central tendon
Muscle fiber
bundles attached
to one side, two
sides or around
multiple central
tendons
Muscles of
Mastication
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
“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/hi
stoweb/nervous/nervous.htm
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