The Latin word for the brain is cerebrum. The equivalent term derived from Greek is cephalo-. If we talk of a A cavity, within the spinal cord, which is filled with cerebrospinal fluid. Syringomyelia cavities come in various “shapes and sizes”, from short, spindle-shaped cavities through to long, tense cavities extending throughout the greater part of the spinal cord. Read more cavity expanding in a cephalad direction, we mean that it is expanding upwards.