tmj its articular contents, ligaments, relations, blood supply and nerve supply

1. TEMPEROMANDIBULAR
JOINT

2. Introduction
 Synovial joint of the condylar variety.
 Formed by head of the condyle and glenoid fossa
of the temporal bone
 Glynglimoarthroidal joint – sliding hinge joint

3. The components of tm joint
 Articular surface
 Articular disc
 ligaments

4. Articular surface
1 Upper articular surface
(formed by parts of temporal bone)
articular eminence Anterior part of
mandibular fossa
2. Inferior articular surface formed by the head of the
mandible
3.Articular surface is covered by fibrocartilage

5. Articular disc
 Oval fibrous plate
 Divides the joint cavity into an upper and a lower
compartment
 Upper compartment- gliding movement
 Lower compartment- rotatory as well as gliding
movements
 Periphery is attached to the fibrous capsule

6. Ligaments

7. Fibrous capsule
It is attached
 above to the articular tubercle, the cicumference
of the mandibular fossa and the squamotympanic
fissure
 Below to the neck of mandible
 The capsule is loose above the intra articular disc
and tight below it
 Synovial membrane lines the fibrous capsule and
the neck of mandible

8. Lateral (tmj) ligament
 Reinforces and strengthens the lateral part of the
capsular ligament
 Fibers directed downwards and backwards
 Attached above to the articular tubercle
 Below to the posterolateral aspect of the neck of
the mandible

9. Sphenomandibular ligament
 Acessory ligament ,lies on a deep plan away
from the fibrous capsule
 Attached superiorly to the spine of the
sphenoid
 And inferiorly to the lingula of the mandibular
foramen
 Remant of the dorsal part of meckel’s
cartilage

10. The ligament is related laterally to
 The lateral pterygoid
 The auriculotemporal nerve
 The maxillary artery
 Inferio alvelar nerves and vessels
Related medially to
 The meial pterygoid
 The chorda tympani nerve
 The wall of the pharynx
Pierced by mylohyoid nerves and vessels near its
lower end

11. Stylomandibular ligament
 Accessory ligament of the joint
 Represents a thickened part of the deep cervical
fascia which separates the parotid and
submandibular salivary glands
 Attached above to the lateral surface of the styloid
process
 Below to the angle and posterior border of the
ramus of the mandible

12. Relations of temporomandibular
joint
Lateral
a. skin and fasciae
b. parotid gland
c. temporal branches of the facial nerve
Medial
a. the tympanic plate separates the joint from the
internal carotid artery
b. spine of the sphenoid
c. the auriculotemporal and chorda tympani nerves
d. midle meningeal artery

13.  Anterior
A. lateral pterygoid
B. massetric nerves and vessels
 Posterior
a. the parotid gland separates the joint from the
external auditory meatus
b. superficial temporal vessels
c. auriculotemporal nerve
 Superior
a. middle cranial fossa
b. middle meningeal vessels
Inferior
a. maxillary artery and vein

14. Blood supply
Branches from superficial temporal and
maxillary arteries
Nerve supply
a. auriculotemporal nerve
b. masseteric nerve

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