In contrast to thoracic vertebra, lumbar vertebra has a wide disc space, sagittally oriented facets, and suf-ficient space between its lamina to permit a considerable range of motion. The vertebral body is the anterior portion of a vertebra and the vertebral arch is the posterior portion of it and surrounds the vertebral foramen.

A typical lumbar vertebra has 2 main structures which are vertebral body and vertebral arch. The arch is formed by the paired pedicles and paired laminae. The left and right laminae and the spinal process form the. Laminae of the vertebral arch (Lamina archus vertebrae) are plates of bone that extend from the pedicles. The arch encloses the posterior portion of the vertebral foramen. Each spinal nerve exits through an intervertebral foramen, located between adjacent vertebrae. The vertebral or neural arch (Arcus vertebrae) is formed by the two pedicles, two laminae, and spinous process. The vertebral foramen provides for passage of the spinal cord. Arising from the vertebral arch are the transverse, spinous, superior articular, and inferior articular processes. The lumbar spine includes five large vertebra situated between the relatively immobile rib cage and the pelvis. A typical vertebra consists of a body and a vertebral arch. The arch is formed by the paired pedicles and paired laminae. The laminae provide attachment for the ligamentum flavum. The pedicles attach on either side to the posterolateral aspects of the vertebral body and unite posteriorly with the laminae which complete the vertebral arch. The vertebral arch is formed from two pedicles and two laminae. The cervical, thoracic and lumbar vertebra are named as the movable vertebra and the sacral and coccygeal vertebra are named as the fixed vertebra. The vertebral arches of lumbar vertebrae consist of paired of pedicles and laminae which encircle the vertebral foramen and ultimately support seven main processes. The structure indicated is the lamina of the vertebra. The hollow spinal canal contains the spinal cord, fat, ligaments, and blood vessels. The spinal column is separated into the 7 cervical vertebra, the 12 thoracic vertebra, the 5 lumbar vertebra, the 5 sacral vertebra and the 4 coccygeal vertebra. The arch is made of two supporting pedicles and two laminae (Fig.

Vertebral arch and lamina