BIOL 115 Lecture Notes - Lecture 3: Soft Tissue, Articular Tubercle, Mastication
Document Summary
Mandibular elevation and depression are symmetrical between right and left joints. Mandibular condyle must roll and glide (not sure if concurrently or sequentially) Rotation- mandibular condyle spins relative to inferior disc in lower joint. Translation- mandibular condyle and disc glide along articular eminence in superior joint between disc and articular eminence. Protrusion- 3-6 mm, lower teeth surpass upper teeth by several mm, important component needed for maximal mandibular depression. Retrusion- 3-4 mm, important component for mandibular elevation from maximally depressed mandible. 8-15 mm, involves 2 asymmetrical movements (chewing and grinding food) Ipsilateral spinning around vertical axis within mandibular fossa. Contralateral mandibular condyle translates anteroinferior along articular eminence. Slight amount of spin and lateral glide needed to complete maximal lateral deviation. Involved rotating one condyle around ap axis while other condyle depresses (frontal plane motion of mandible as chin moves downward and deviates from midline toward condyle that is spinning)
