The temporomandibular joint the tmj is the joint between the lower jawbone the mandible and the temporal bone of the skull. The TMJ is responsible for jaw movement and is the most used joint in the body. The TMJ is essentially the articulation between the condyle of the mandible and the mandibular fossa a socket in the temporal bone. The unique feature of the TMJ is the articular disc a flexible and elastic cartilage that serves as a cushion between the two bone surfaces. The disc lacks nerve endings and blood vessels.
In its center and therefore is insensitive to pain. anteriorly it attaches to lateral pterygoid muscle a muscle of chewing. Posteriorly it continues as retrodiscal tissue fully supplied with blood vessels and nerves. The mandible is the only bone that moves when the mouth opens. The first 20 mm opening involves only a rotational movement of the condyle within the socket. For the mouth to open wider, the condyle and the disc have to move out of the socket, forward and down the articular eminence, a convex bone surface located anteriorly.
To the socket . this movement is called translation. The most common disorder of the TMJ is disc displacement, and in most of the cases, the disc is dislocated anteriorly. As the disc moves forward, the retrodiscal tissue is pulled in between the two bones. This can be very painful as this tissue is fully vascular and innervated, unlike the disc. The forward dislocated disc forms an obstacle.
For the condyle movement when the mouth is opening. in order to fully open the jaw, the condyle has to jump over the back end of the disc and onto its center. This produces a clicking or popping sound. Upon closing, the condyle slides back out of the disc hence another click or pop. This condition is called disc displacement with reduction . In later stage of disc dislocation, the condyle stays behind the disc all the time, unable to get back onto the disc, the clicking sound disappeared but mouth opening is limited.
This is usually the most symptomatic stage the jaw is said to be locked as it is unable to open wide. At this stage the condition is called disc displacement without reduction Fortunately, in majority of the cases, the condition resolves by itself after some time. This is thanks to a process called natural adaptation of the retrodiscal tissue, which after a while becomes scar tissue and can functionally replace the disc. In fact, it becomes so similar to the disc that it is called a pseudodisc.
Top 10 Mouth Cancer Symptoms How Facts
Top 10 symptoms of mouth cancer Cancer is defined as tumor resulting from an uncontrolled division of cells that enters and cause damage to our body cells tissues. Oral cancer is where a tumor develops on the surface of the tongue, mouth, lips or gum and it does not go away. Tumors can also occur in the salivary.
Glands, tonsils and the part of the throat from your mouth to your windpipe but these are less common and they become dangerous if they were not treated at early stage. What are the symptoms of oral cancer? The common and easily identical symptoms include: 1. Inside the mouth area either on lips and gums there will be some kind of swelling,.
Lumps, rough red spots. 2. White and red soft covering grows inside the mouth. 3. Mysterious blood flow in mouth area. 4. Inexplicable emotions, feelings lost, continuous pain in mouth or neck area. 5. Obstinate spots on mouth face and neck that flow blood easily and cannot heal easily within 14 days.
6. person feels that something get jammed in the back of throat. 7. Person fells much pain and difficulty in speaking, eating or moving the jaws and tongue. 8. Harshness, sore throat, ear pain and changing of voice is also a symptom of this disease. 9. Fastest weight loose. 10. Change in the pattern of fitting of teeth. If you notice any of these symptoms happening, immediately visit to your dentist or any.