11. This aponeurosis formed from fibres from either side of the external oblique decussates at the linea alba. 12. The petioles and held in a decussate pairs, but twisted so they lie in one plane. 13. These neurons decussate to the opposite side ( anterolateral ), and travel up the spinal column. 14. It is still undetermined if the spinoreticular tract possesses ipsilateral fibers in addition to those that decussate . 15. The rest is densely spirally striate, with light incremental lines which decussate the lirulae, especially beneath. 16. The phyllotaxy is usually opposite and decussate , but leaves have a spiral or alternate arrangement in some groups. 17. At this point, second order neurons decussate and relay information through the contralateral medial lemniscus to the thalamus. 18. Then the fibers decussate and form the middle cerebellar peduncle, terminating in the cerebellar cortex as mossy fibers. 19. The neurons in the optic nerve decussate in the optic chiasm with some crossing to the contralateral optic nerve tract. 20. The fibers that do not decussate will pass through the medulla and continue on to form the anterior corticospinal tracts.
