TMJ Anatomy
Original Editor - Laurel
Top Contributors - Laurel, Admin, Janine Rose, Kim Jackson, WikiSysop, Wendy Walker and Jess Bell
Description[edit | edit source]
The temporomandibular joint (TMJ) is the joint between condylar head of the mandible and mandibular fossa of the temporal bone. It is a synovial, condylar and hinge-type joint. The joint involves fibrocartilaginous surfaces and an articular disc which divides the joint into two cavities.[1] The TMJ is a part of the stomatognathic system system. This system is made up off the TMJ, teeth and soft tissue. This system plays a role in breathing, eating and speech.[2] It also plays a role in kissing, yawning and sucking.[1]
Movements[edit | edit source]
A variety of movements occur at the TMJ. These movements are mandibular depression, elevation, lateral deviation (which occurs to both the right and left sides), retrusion and protrusion.
Resting Position and Close-Packed Position[edit | edit source]
The resting position of the TMJ is with the mouth slightly open, the lips together and the teeth not in contact. This is in contrast to the closed-pack position in which the teeth are tightly clenched.[1]
