Temporomandibular Joint (TMJ) Anatomy and Function Quiz

The Glenoid Fossa is a part of the temporomandibular joint (TMJ) located under the zygomatic/temporal connection towards the posterior. It is not located at the base of the skull, within the nasal cavity, or behind the ear canal.

The lateral pterygoid muscle is a key muscle involved in jaw movement and it joins with the articular disk within the temporomandibular joint.

The ligament of the TMJ is the articular capsule, which surrounds the joint and provides stability.

The capsular ligament's function is to prevent anterior dislocation by limiting down and forward movement of the joint.

The Temporomandibular Ligament acts as the main suspensory ligament during hinge movement and limits retraction of the mandible, but it does not directly help in chewing food, support the upper teeth, or have any association with the inner ear.

Accessory ligaments in the human body include the sphenomandibular and stylomandibular ligaments, which are located in the jaw area. The incorrect answers provided do not correspond to actual accessory ligaments in the human body.

The sphenomandibular ligament has a specific origin and attachment, as well as a unique function related to jaw movement. The incorrect answers provided do not accurately describe the sphenomandibular ligament's characteristics and functions.

The stylomandibular ligament originates from the styloid process and attaches to the posterior border of the ramus just above the angle, limiting anterior movement of angle during protrusion. The incorrect answers provide a variety of functions and attachments that are not related to the stylomandibular ligament.

The lateral and medial discal ligaments do not connect the condyle to the skull bones, enable rotation of the mandible, or provide cushioning within the joint space. Their main function is to restrict movement of the disc away from the condyle by attaching to the medial and lateral poles of the condyle and dividing the joint into superior and inferior spaces.

The major planes of mandibular movement are the horizontal plane, which involves side-to-side movements, and the sagittal plane, which involves forward and backward movements.

The articular eminence is the structure that forms the anterior wall of the temporomandibular joint, providing support and stability for the joint movement.

The meniscus refers to an articular disc found in the temporomandibular joint, it is not a structure related to the vertebral column, patella, or synovial fluid.

The correct answer provides details about the orientation of the TMJ, its articulation with the glenoid fossa, and its position on the disc. The incorrect answers provide inaccurate information about the function, location, and composition of the TMJ.

The posterior margin of the articular surface of the condyle attaches to the inferior retrodiscal lamina, a key structure in the temporomandibular joint. The other options provided do not represent accurate attachments in this context.

TMJ refers to the temporomandibular joint, which is the joint connecting the jawbone to the skull.

The lateral pterygoid muscle attaches between the anterior superior attachment to the temporal bone and the inferior attachment to the anterior margin of the articular surface of the condyle. The incorrect options provide different attachments that are not accurate for the lateral pterygoid muscle.

Arthrodial movement refers to the translational movement of the condyle against the anterior wall of the glenoid fossa, which is enabled by the upper joint compartment. This particular movement allows for certain functions in the temporomandibular joint.

The correct term for the TMJ joint is ginglymoarthrodial joint, which allows for both hinging and sliding movements.

The right lateral pterygoid muscle is responsible for moving the jaw to the right direction, while the left lateral pterygoid, masseter, and temporalis muscles are involved in other movements of the jaw.

The correct answer identifies the specific inclines that guide tooth occlusal movements during the process of chewing and speaking. The incorrect answers provide different combinations of inclines that do not accurately represent the guiding inclines in dentistry.

Incisal guidance refers to how the lingual surfaces of the maxillary incisors influence the movements of the mandible during occlusion.

Cuspid guidance refers to the disclusion of all other teeth by the canines in lateral excursions.

Group function refers to the way teeth on one side of the mouth function together during chewing, where the lateral forces are distributed to a group of teeth on the working side.

The determinants of occlusion refer to factors related to the alignment and contact between the teeth in upper and lower jaws, as well as the function of the temporomandibular joints and the neuromuscular system. Factors like the type of toothbrush used, frequency of dental check-ups, and consumption of sugary foods and drinks do not directly determine occlusion.

During chewing stroke initiation, the lateral pterygoid muscle of the non-working side is primarily responsible. This muscle helps in moving the mandible and initiating the chewing process.

During maximum intercuspation, the non-working side makes contact due to the downward, forward, and medial movement of the non-working condyle.

In Angle's classification, Class I occlusion is when the mesiobuccal cusp of the upper first molar is aligned directly over the mesiobuccal groove of the lower first molar.

In dental occlusion classification, Class II refers to distocclusion where the mandibular first molar is positioned distal to the maxillary first molar, commonly known as an 'overbite'. The incorrect answers provided represent other occlusal relationships to differentiate Class II from other classifications like mesial occlusion, distocclusion with 'under bite', and neutroclusion which depicts normal occlusion without any specific positioning.

Class III malocclusion is characterized by the lower jaw being further forward than the upper jaw, leading to the overbite. It is considered rare and typically requires surgical correction for the best outcome.