decussate

Crossed; intersected; resembling a letter X.

Having anatomical structures or markings crossing each other, typically in an X shape or at right angles.

Having opposite leaves arranged alternately at right angles.

Juniperites, ju-ne-per-i′tis, s[ubstantive]. A genus of fossil plants, in which the branches are ranged irregularly; leaves short, obtuse, inserted by a broad base, opposite, decussate, and arranged in four rows.

Consisting of two rising and two falling clauses, placed in alternate opposition to each other.

a decussated period

To form an X or to cross or intersect.

The two trochlears decussate in the anterior medullary velum.