List the characteristics of the spinal cord at the lumbar and sacral levels

Lumbar segments, characteristics:
1. Nearly circular in shape
2. Have large anterior and posterior horns
3. Have lesser white matter than cervical segment
4. Anterior horns have a blunt process that extends into the lateral funiculi
5. L1 and L2 contain a large well developed dorsal nucleus and intermediolateral cell column.
Characteristics of the sacral segments:
1. Have small size
2. Large amount of grey matter
3. Small amount of white matter
4. Anterior and posterior horns are large
5. Caudally, the sacral segments diminish in general diameter.

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