What Is the Posterior Longitudinal Ligament?
The posterior longitudinal ligament is located behind the vertebral body in the spinal canal and is narrow and tough.
- Chinese name
- Posterior longitudinal ligament
- Foreign name
- posterior longitudinal ligament
- Organization
- Connective tissue
- Device officer
- ligament
- System
- exercise system
- Cell
- osteoblast
- The posterior longitudinal ligament is located behind the vertebral body in the spinal canal and is narrow and tough.
Posterior longitudinal ligament concept
- It is the long ligament of the spine, which starts from the pivot and continues with the covering of the vertebral body, and reaches the sacrum. It is tightly connected to the intervertebral disc fiber ring and the upper and lower edges of the vertebral body, but is loosely combined with the vertebral body, which has the effect of limiting excessive forward flexion of the spine. Its length is equivalent to that of the anterior longitudinal ligament, and the part that is in contact with the vertebral body is relatively narrow, but it is wider at the intervertebral disc. The posterior longitudinal ligament can limit the excessive forward flexion of the spine and prevent the disc from coming out.
Morphology of posterior longitudinal ligament of cervical spine under surgical microscope
- The superficial fibers span several intervertebral spaces and are divided into a central longitudinal running portion and a bilateral dilated portion, wherein the bilateral dilated portions run obliquely and are connected to the pedicle and nerve root sheath. The middle layer is a longitudinal fiber, spanning a single intervertebral disc, starting from the lower vertebral venous hole and ending above the next vertebral venous hole. It is loosely connected to the superficial posterior longitudinal ligament and can be easily peeled off with microscopic instruments. The deep fibers originate from the posterior edge of the vertebra adjacent to the disc. Unlike the Sharpey fibers, which are considered to be the outer layer of the annulus fibrosus, which end at the fibrocartilage end plate, the tissue section observation under light microscope can make the two distinguish. The deep layer of fiber spans a single intervertebral space, and is also divided into a central longitudinal running portion and a bilateral expansion portion, in which the bilateral expansion portion travels obliquely and is connected to the rear of the hook joint.
Morphology of the posterior longitudinal ligament of the cervical spine under the optical microscope of the posterior longitudinal ligament
- The posterior central posterior longitudinal ligament fibers of the cervical intervertebral disc travel longitudinally, with a dense structure and an orderly arrangement; while the paracentral posterior longitudinal ligament travels obliquely, the structure is loose, the arrangement is sparse, and there is loose connective tissue filling.