Related Experiment Video
Updated: Jul 14, 2026

Studying Orthodontic Tooth Movement in Mice
Published on: August 2, 2024
Os odontoideum with associated multidirectional atlantoaxial instability: imaging and clinical considerations
Shawn Henderson1, Donald Henderson
1Kingsway Health & Rehabilitation Associates, 2974 Bloor Street West, Etobicoke, Ontario M8X 1B9, Canada. dr.shawnhenderson@rogers.com
Abstract:
Acquired anomalies of the craniovertebral junction although rare, may result in serious clinical sequella. The prevalence of craniovertebral anomalies remains unknown since they may remain clinically silent. Os odontoideum is one such anomaly. The etiology remains controversial over whether it is a post-traumatic or congenital condition but the clinical considerations of os odontoideum remain the same. Chiropractors may encounter os odontoideum in the subclinical patient with the potential for deleterious effects with manipulation. Radiography is essential to its detection.
Related Concept Videos
Articulations of the Vertebral Column
Overview of the Axial Skeleton
The axial skeleton of the adult...
Cranial Bones: Superior and Posterior View
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
Cranial Bones: Lateral View
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
Tooth Anatomy
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.