lumbosacral enlargement

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lum·bo·sac·ral en·large·ment

[TA]
a spindle-shaped swelling of the spinal cord beginning at the level of the tenth thoracic vertebra and tapering into the medullary cone, with maximum thickness opposite the last thoracic vertebra, consequential to the innervation of the lower limb.
Farlex Partner Medical Dictionary © Farlex 2012
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The lumbar enlargement extends from T9-T12 and is associated with innervation of the lower limb via the lumbar plexus (L1-L4) and the sacral plexus (L4/L5 & S1/S3).