Temporomandibular Joint

aknight1302's version from 2015-12-01 16:47


Question Answer
What are the two types of joint movement?Rotational and Translational
Joint movement is best characterized as the movement as one ___ against another ___bone against bone
What joint has 6 degrees of freedom? (two degrees in each of the three planes)Temporomandibular Joint
How many degrees of freedom does the TMJ have?SIX dof, (two in each of the Sagittal, Coronal, and Horizontal planes)
The TMJ is the connection between what two structures?Condyle (of the mandible) Glenoid Fossae (of the Temporal Bone)
How many articular surface are there in the TMJ?9
What is the "most important" articular surface of the TMJ?Occlusion of teeth
Structure anterior to the Glenoid FossaeArticular Eminince
What ligaments prevent posterior dislocation of the condyle?Lateral Ligaments
Band of Fibrous tissue that divides Condyle and Glenoid Fossae into multiple joints?ARTICULAR DISC
What are the two lateral TMJ ligaments?Superficial Oblique & Deep Horizontal
What type of joint is enclosed in a capsule?Synovial Joint
The articular surfaces of MOST synovial joints are lined with...Hyaline Cartilage
The TMJ's articular surface is lined with...NONCARTILAGENOUS Fibrous Tissue
Bilateral coupling is a UNIQUE feature to what joint?TMJ
External Auditory Meatus is ___ in relation to the Condyle?Posterior to
The Articular Disc is attached by ___ to the ___ and ___ bonesLigaments, Condyle, Temporal
What is the name of the region behind the POSTERIOR BAND of the Articular Disc?Posterior LAMINAR ZONE
In anterior disc displacement, the disc is no longer covering the condyle and is pressing against ____?the sensitive posterior bilaminar zone
When is the Articular Disc slanted forward atop the Condyle?Centric Relation (or normal relationship)
When is the Condyle separated from the Glenoid Fossae by the THICK posterior band?Centric Relation (or normal relationship)
When is the Condyle separated from the Articular Eminince by the THIN
Question Answer
What is bone grinding against bone called (without protective cover)?Osteoarthritis
What ligaments attach the ARTICULAR DISC to the CONDYLE?Condylomeniscal Ligaments (medial and lateral) (aka Condylodiscal)
"The ___ relationship of condyle (when the mouth is close) is when it is seated in glenoid fossae, separate from it by the posterior thick band of the articular disc"normal, anatomical
What is the blood supply for the Condyle?Superficial Temporal vessels
What nerves run into the central portion of the Articular Disc Proper?(TRICK QUESTION) NO nerve supply to Articular Disc Proper
What grows first, Maxilla or Mandible?Maxilla grows first (mandible always tries to catch up)
What are the two differences between MCC and epiphyseal plate?1. MCC grows in response to TENSILE force, 2. MCC cells do not line up for COLUMNAR growth (growth by expansion)
What type of cartilage is in MCC?SECONDARY cartilage
What type of cartilage does not intrinsically grow on its own?SECONDARY cartilage
Bone growth of the Mandible is done byEndochondreal Ossification (in response to Tensile Forces)
The subarticular component of the condyle is theFibro-Cartilagenous zone
What articular surface has bone, cartilaginous, and Fibro-elastic layer?Condylar surface (MCC)
What articular surface has only bone and fibro-elastic layer?Glenoid (mandibular) fossae (not actually on mandible, part of temporal bone)
What three parts make up the Articular Disc proper?Anterior thick band, Intermediate Thin band, Posterior Thick band
What type of fibers make up the bulk of the articular disc?Collagen Type 1
True or False: The articular disc is made of cartilageFALSE. The articular disc is made of Collagen Type 1, NOT CARTILAGE
What is the only portion of the Articular Disc with Elastic fibers?UPPER LAMELLA of the Posterior Bilaminar Zone (PBLZ)
What lines the Temporomandibular Joint capsule?Synovial Membrane
Synovial fluid containsHyaluronic Acid, Plasma Proteins, and cell fragments
What structure removes old synovial fluid and replenishes it?Synovial Membrane
What type Synovial Intima cells PHAGOCYTIZE?Type A
What type Synovial Intima cells SECRETE?Type B
What part of Synovial Membrane has Elastic Fibers?Sub-Intima
What part of Synovial Membrane has Macrophages and Mast cells?Sub-intima
What part of Synovial Membrane blends with the fibrous tissue of the capsule?Sub-intima
What part of Synovial Membrane has Phagocytic (synovial fund) and Secretory cells?Intima
What part of Synovial Membrane lacks a basement membrane and is 1-4 cell layers thick?Intima
What part of the articular disc is covered by synovial membrane?posterior bi-laminar zone
Merckel's Cartilage forms with the FIRST ____ ARCH (embryo development)BRANCHIAL
Mandible and TMJ form where in relation to Merckel's cartilage?Lateral to Merckel's cartilage
Fate of Merckel's cartilage (Anterior, Posterior, and Intermediate)Ant: incorporated into mandible; Intermediate: Spheno-mandibular Ligament; Post: Malleus and Incus bones of the ear
What muscle inserts into the articular disc?Lateral Pterygoid
Pinto's Ligament connects what to what (if it even exists)TMJ to INNER EAR
Bones of TMJ form through what type of bone formation?Intramembraneous

Muscles associated with TMJ Movements

Question Answer
ElevationT + MPt + M (both sides)
DepressionLPt + SH (Supra-Hyoid) + IH (inferior hyoid) (both sides) (dont worry about SH and IH)
ProtrusionLPt + MPt + M (both sides)
RetrusionT (horizontal) + M (deep) (both sides)
Lateral ExcursionT + M (working/same side) + LPt + MPt (non-working/opposite side)

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