Final answer:
The articular disc of the temporomandibular joint is attached in front to the Lateral pterygoid muscle, which is instrumental in the mouth opening mechanism.
Step-by-step explanation:
The articular disc of the temporomandibular joint (TMJ) is attached (in front) to the Lateral pterygoid muscle. The TMJ is a complex joint that allows for various movements of the mandible, such as elevation, depression, protraction, retraction, and side-to-side motions. The articular disc is crucial in ensuring smooth movements by filling the gap and providing cushioning between the skull's temporal bone and the condyle of the mandible. The lateral pterygoid muscle plays a significant role in the opening of the mouth by pulling the mandible and the articular disc anteriorly.
During depression of the mandible (opening of the mouth), the mandibular condyle moves both forward and downward as it travels from the mandibular fossa onto the articular tubercle.