Vertebral arch
Vertebral Arch
The vertebral arch (pronounced: ver-te-bral arch) is a key anatomical structure in the vertebral column or spine. It is formed by two pedicles and two laminae.
Etymology
The term "vertebral" is derived from the Latin word "vertebra", which means a joint or something to turn. The term "arch" comes from the Latin word "arcus", meaning a bow or curve.
Structure
The vertebral arch, along with the vertebral body, forms the vertebral foramen, which houses the spinal cord. The arch is composed of two parts: the pedicles and the laminae.
- Pedicles: These are two short, stout processes that extend from the posterior aspect of the vertebral body. They connect the body to the laminae.
- Laminae: These are two broad, flat plates of bone that extend from the pedicles. They meet in the midline to complete the arch.
The vertebral arch also gives rise to several processes, including the spinous process, transverse process, and articular process.
Function
The primary function of the vertebral arch is to protect the spinal cord. It forms the posterior wall of the vertebral foramen, providing a bony enclosure for the cord. The arch also serves as an attachment site for muscles and ligaments involved in movement and stabilization of the spine.
Related Terms
- Vertebral column: Also known as the spine, it is a column of vertebrae that extends from the base of the skull to the pelvis.
- Spinal cord: The main pathway for information connecting the brain and peripheral nervous system.
- Spinous process: A bony projection off the posterior of each vertebra, to which muscles and ligaments attach.
- Transverse process: Two lateral projections from the vertebral arch, serving as attachment sites for muscles and ligaments.
- Articular process: Projections of the vertebral arch that form the joint connecting adjacent vertebrae.
External links
- Medical encyclopedia article on Vertebral arch
- Wikipedia's article - Vertebral arch
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