Fusal

Round the fusal fibres there wind, in spiral form, large myelinated posterior root fibres, of which several subserve each spindle.

On the writer's theory, if the fusal chromomeres synapsed, but the rest of the two chromonemas was in reverse order, crossing over could take place only close to the fusal chromomeres.

The light fraction contains low-boiling aldehydes and many other oxygen-containing organic compounds, while the heavy fraction is mainly fusal oil.

the fusal muscular fibers