The cervical spine naturally has a curved shape called lordosis, which is created by the wedge-shaped cervical vertebrae and helps to balance out the curve in the thoracic spine called kyphosis. The lumbar spine has been found to bear more weight in the front part (67% to 82%), and less weight in the back part (18% to 33%). Most of the weight is carried by the posterior column, which takes up about 64%, while the anterior column carries around 36%. ![]() This weight is then passed to a joint called C1-2 and divided into two parts – anterior column (including a disc between C2 and C3) and posterior column (including joints between C2 and C3). The head’s weight is supported by the condyle. The ligamentous complex and the posterior arch make up the posterior column.The middle column is composed of the posterior half of the vertebral body, the posterior annulus fibrosis, and the posterior longitudinal ligament.The vertebral bodies and discs make up the anterior column, while the two posterior columns are made up of the facet joints that articulate with each other. ![]() To describe the stability of the cervical spine, literature has divided its bone structure into three primary columns, one anterior and two posterior: The sagittal plane’s center of mass of the head is located directly above the occipital condyle, approximately one centimeter anterior and superior to the external auditory canal.Īny deviations from the typical alignment of the head’s mass will cause an increase in cantilever loads, leading to a rise in the amount of energy muscles need to expend. The main functions of the cervical spine are to maintain the position of the head in relation to the body and to control the level of horizontal gaze.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |