To state briefly the anatomy of the temporomaxillary joint and its associated parts, first, from the osseous standpoint, there is the condyle and its neck, the sigmoid notch and the coronoid process. Overlying these structures, we have the zygomatic process and its anterior root, which is broad and strong, to terminate in a rounded eminence, the eminentia articularis. This eminence forms the anterior boundary of the glenoid fossa, and in the recent state is covered with cartilage. The middle root forms the posterior boundary of the mandibular portion of the glenoid fossa. The glenoid fossa is bounded posteriorly by the vaginal and auditory processes. The junction of the anterior root with the zygoma is a projection called the tubercle, for attachment of the external lateral ligament of the lower jaw. Between the anterior and middle roots is an oval depression forming part of the glenoid fossa for the reception of