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  2. Lumbar vertebrae - Wikipedia

    en.wikipedia.org/wiki/Lumbar_vertebrae

    The lumbar vertebrae are located between the thoracic vertebrae and pelvis. They form the lower part of the back in humans, and the tail end of the back in quadrupeds. In humans, there are five lumbar vertebrae. The term is used to describe the anatomy of humans and quadrupeds, such as horses, pigs, or cattle.

  3. Vertebra - Wikipedia

    en.wikipedia.org/wiki/Vertebra

    The transverse process of a lumbar vertebra is also sometimes called the costal [9] [10] or costiform process [11] because it corresponds to a rudimentary rib (costa) which, as opposed to the thorax, is not developed in the lumbar region.

  4. Articular process - Wikipedia

    en.wikipedia.org/wiki/Articular_process

    The articular process or zygapophysis (Greek: ζυγόν, romanized: zugón, lit. ' yoke ' + apophysis ) of a vertebra is a projection of the vertebra that serves the purpose of fitting with an adjacent vertebra.

  5. Lumbar - Wikipedia

    en.wikipedia.org/wiki/Lumbar

    The lumbar region is sometimes referred to as the lower spine, or as an area of the back in its proximity.. In human anatomy the five lumbar vertebrae (vertebrae in the lumbar region of the back) are the largest and strongest in the movable part of the spinal column, and can be distinguished by the absence of a foramen in the transverse process, and by the absence of facets on the sides of the ...

  6. Costal facet - Wikipedia

    en.wikipedia.org/wiki/Costal_facet

    A costal facet is a site of connection between a rib and a vertebra. The costal facets are located on the vertebrae that the rib articulates with. They are the superior costal facet, the inferior costal facet, and the transverse costal facet. [1] Rib 1 only articulates with a transverse costal facet.

  7. Spinal column - Wikipedia

    en.wikipedia.org/wiki/Spinal_column

    The number of vertebrae in a region can vary but overall the number remains the same. In a human spinal column, there are normally 33 vertebrae. [3] The upper 24 pre-sacral vertebrae are articulating and separated from each other by intervertebral discs, and the lower nine are fused in adults, five in the sacrum and four in the coccyx, or tailbone.

  8. Facet joint - Wikipedia

    en.wikipedia.org/wiki/Facet_joint

    The biomechanical function of each pair of facet joints is to guide and limit movement of the spinal motion segment. [1] [2] In the lumbar spine, for example, the facet joints function to protect the motion segment from anterior shear forces, excessive rotation and flexion. Facet joints appear to have little influence on the range of side ...

  9. Transpyloric plane - Wikipedia

    en.wikipedia.org/wiki/Transpyloric_plane

    The lower border of first lumbar vertebra lies at the level of the transpyloric plane. [3] Despite the conus medullaris, the end of the spinal cord, being understood to typically terminate at the level of the transpyloric plane, there is significant variability. Up to 40% of people have spinal cords ending below the transpyloric plane. [2] [4]