lumbar spine

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1. a thornlike process or projection; called also acantha and spina.
2. the rigid bony structure in the midline of the back, composed of the vertebrae; called also backbone, spinal column, and vertebral column.

The spinal column is the axis of the skeleton; the skull and limbs are in a sense appendages. The vertebrae also provide the protective bony corridor (spinal canal) through which the spinal cord passes; they can move to a certain extent and so give flexibility to the spine, allowing it to bend forward, sideways and, to a lesser extent, backward. In the areas of the neck and lower back, the spine also can pivot, which permits the turning of the head and torso.

There are usually 24 movable vertebrae and nine that are fused together. The topmost are the seven cervical vertebrae, which form the back of the neck, supporting the skull. The head turns from side to side by means of a pivotal motion between the two highest vertebrae. Below these are the 12 thoracic vertebrae, the supports on which the ribs are hinged, and then the five lumbar vertebrae, the largest movable vertebrae (the cervical are the smallest). Below the lumbar vertebrae, the spine terminates with two groups of vertebrae fused into single bones: the sacrum, composed of five vertebrae, and the coccyx, composed of four vertebrae. Viewed from the side of the body, the spine has the shape of a gentle double S curve.
Malformations of the Spine. Of the various types of spinal malformations, some are congenital and others the result of postural defects or injuries. spina bifida is congenital. kyphosis may occasionally be congenital but is more often caused by one of the diseases that attack the structure of the bones. The most common of these is pott's disease, or tuberculosis affecting the vertebrae and soft tissues of the spine. Another is osteitis deformans, a type of bone inflammation in which parts of the bone are replaced by softer tissue. scoliosis is a curvature of the spine toward one side.
cervical spine that portion of the spine comprising the cervical vertebrae.
lumbar spine that portion of the spine comprising the lumbar vertebrae.
thoracic spine that part of the spine comprising the thoracic vertebrae.

lumbar spine (L-spine)

that portion of the spine comprising the lumbar vertebrae.

Lumbar spine

The segment of the human spine above the pelvis that is involved in low back pain. There are five vertebrae, or bones, in the lumbar spine.
Mentioned in: Low Back Pain
References in periodicals archive ?
Therefore, the sitting position with the knees above the hip line, typical for armchairs or car seats, causes the stretching of the lumbar spine.
The results of this study suggest that the width between the pars interarticulares, or interpars distance, does indeed increase in size as it descends the lumbar spine.
The worst effect of flexion upon the lumbar spine is that it compresses the anterior disc.
Among 667 cases undergoing posterior lumbar spine surgery, two cases were diagnosed as perforation of the left iliac artery and vein during lumbar discectomy.
The major trunk muscles responsible for resisting and controlling the bending moment and anterior shear forces acting on the lumbar spine when lifting and lowering are the erector spinae (Macintosh and Bogduk 1986, McGill et al 1988).
1% greater gain in lumbar spine BMD than with placebo, while those with a 10-year risk of 6.
In Table 1, the average angles for the dominant and nondominant hips as well as the lumbar spine were compared between sexes during axial trunk rotation.
1997) Adaptation of the lumbar spine to different positions in bicycle racing.
Director of the Spine Center of Celebration Health, Celebration, Florida, adds, EoACA[pounds sterling]The VerteBRIDGE plating technology, which has been proven in the direct anterior applications of the ROI-A and ROI-C cages, is especially suited for stand-alone constructs implanted through an oblique or lateral approach to the lumbar spine.
BMD was assessed by dual-energy x-ray absorptiometry at the lumbar spine, hip, and femoral neck.
An anteroposterior radiograph of the pelvis and anteroposterior and lateral radiographs of the lumbar spine were taken in all patients.