Rostrolateral to the gracile and cuneate tubercles, a thick round ridge is ______ .
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The lumbosacral enlargement is situated from ______ to ______ .
The cervical enlargement is situated from ______ to______ .
Anterior to the grey commissure is a bundle of transverse fibers, called ______ .
The spinal white matter can be divided into ______ , ______ and______ .