Which of the following is least vascular structure in the Temporo-mandibular joint (AIIMS May 2013)
|B||Posterior part of Articular disc|
|C||Middle part of articular disc|
Middle part of the articular disc
1. Articular cartilage of atypical synovial joints like TM joint are not made up of hyaline but of fibrocartilage variety.
2. Fibrocartilage is not entirely avascular and some capillary loops do enter it to make it vascular.
3. Articular disc is also made up of fibrocartilage and is hence slightly vascular.
4. Middle of the articular disc is least vascular as blood vessels do not penetrate that deeply and that is one of the reason it becomes perforated also.