<P> Although the spinal cord cell bodies end around the L1 / L2 vertebral level, the spinal nerves for each segment exit at the level of the corresponding vertebra . For the nerves of the lower spinal cord, this means that they exit the vertebral column much lower (more caudally) than their roots . As these nerves travel from their respective roots to their point of exit from the vertebral column, the nerves of the lower spinal segments form a bundle called the cauda equina . </P> <P> There are two regions where the spinal cord enlarges: </P> <Ul> <Li> Cervical enlargement--corresponds roughly to the brachial plexus nerves, which innervate the upper limb . It includes spinal cord segments from about C4 to T1 . The vertebral levels of the enlargement are roughly the same (C4 to T1). </Li> <Li> Lumbar enlargement--corresponds to the lumbosacral plexus nerves, which innervate the lower limb . It comprises the spinal cord segments from L2 to S3 and is found about the vertebral levels of T9 to T12 . </Li> </Ul> <Li> Cervical enlargement--corresponds roughly to the brachial plexus nerves, which innervate the upper limb . It includes spinal cord segments from about C4 to T1 . The vertebral levels of the enlargement are roughly the same (C4 to T1). </Li>

Where do enlargements of the spinal cord occur
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