Lumbar vertebra L3 – body

Anatomy

Big, wide vertebra (bodies progressively bigger C1 – L5), cylindrical, upper and lower surfaces flat or somewhat concave.

Articulates with vertebrae above and below through fibrocartilaginous discs that allow some vertebral movement and provide shock absorption. No articular facets (unlike those on thoracic for articulation with ribs). No transverse foramina (unlike cervical).

Clinical

Significant flexion and extension, some lateral flexion, small amount of rotation.

Vignette

Spinal cord ends at level L1-2; lumbar puncture site L3-4 or L4-5.

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