Tmj

Question 1

Gengelymus and arthroidal

Answer 1

Back and forth hinging and gliding

Question 2

Borders of glenoid fossa

Answer 2

Borders : glenoid fossa is limited 1- Anteriorly : by articular eminence . 2- Posteriorly : Squamo-tympanic fissure . 3- Medially : Spine of Sphenoid . 4- Laterally : root of zygomatic process

Question 3

Bands of the disc

Answer 3

1- anterior band : split into superior , inferior lamellae 2- Intermediate band : it’s the thinnest central part which is avascular , insensitive . 3- Posterior band : the disk split into superior ( retrodiscal pad ) , inferior lamellae

Question 4

Attachment of posterior superior lamella

Answer 4

Superior lamellae ( retrodiscal pad ) : attached to capsular ligament, to the posterior wall of the glenoid fossa , Squamous tympanic fissure

Question 5

Med and lat attachment of capsule

Answer 5

• Medially & Laterally : Blend with the articular capsule , then both are blend with medial , lateral wall of the condyle , so the disk , condyle move as one unit

Question 6

Inner surface of duct capsule

Answer 6

1- Inner surface is smooth , glistering due to presence of

synovial membrane and its considered an extension of disk.

Question 7

Attachment of the capsule

Answer 7

1- Anteriorly : to articular eminence 2- Posteriorly : to Squamo-tympanic fissure . 3- Superiorly : to Glenoid fossa . 4- Inferiorly : to Neck of the condyle . 5 , 6 - Medially , laterally : Blend with the articular disk , then both are blend with medial , lateral wall of the condyle.
NB: its firmly attached to the neck (below the disk ) & loosely attached to the glenoid fossa ( above the disk ) to allow the translition movement

Question 8

Function of lat tempro mandibular ligament

Answer 8

• Function : restrict the displacement of the mandible in 3 different planes 1. It prevents the lateral dislocation of one joint , so prevent the mesial dislocation of the other side . 2. It prevents or limits the posterior displacement by horizontal component . 3. It Limits the inferior movement by oblique component

Question 9

Collateral ligament

Answer 9

‘’ primary ‘’ : - Site : medial and lateral ligaments between the condyle and disc to be moved as one unit.

Question 10

What is not covered by synovial membrane

Answer 10

Synovial membrane doesn’t cover the articular disk except for the posterior bi-laminar region
and doesn’t cover the articulating surfaces

Question 11

Histology

Answer 11

راجع من المزكرة

Question 12

Arterial and venous supply of tmj

Answer 12

• Arterial supply : deep auricular , super-facial temporal branches of the maxillary artery
  3- Venous Supply : Pterogoid plexus of viens

Question 13

Sensory supply of tmj

Answer 13

Sensory supply : Auriculo-temporal , Massetric branches of mandibular branch of trigeminal nerve

Question 14

Proprioceptor of tmj

Answer 14

1- Ruffini endings : Static mechanoreceptors which position the mandible . 2- Pacinican corpuscles : Dynamic mechanoreceptors . 3- Golgi-tendon organs : Static mechanoreceptors for protection of ligaments around TMj 4- Free nerve ending : the pain receptors for protection of the TMJ itself . 3. Motor supply : to joint muscles

Question 15

Ankylosis cause

Answer 15

Trauma or infection

Question 16

Myo-facial pain dysfunction

Answer 16

syndrome: - Def. : dysfunction of TMJ in which there is masticatory muscle tenderness , limited opening of mandible and joint sounds
… - Site : female more than males . . - cause : stress or spasm of masticatory muslces

Question 17

. Injuries and trauma of tmj

Answer 17

: - causes : 1- local distrubance of normal antomic relation between condyle, disc . 2- part of generalized systemic disease

Question 18

Other clinical considerations

Answer 18

7. Bruxism . 10. aplasia
8. Disk perforation. 11. hypoplasia
9. disharmony in the relation of teeth , TMJ . 12. hyperplasia

Question 19

Example of primary and 2ry joint

Answer 19

costochondral joint is primary

pubic symphysis