(1) Orchids, however, have all possible tetrad types: linear, decussate , square, tetrahedral, rhomboid and T-shaped are all reported.(2) This is much simpler than those reproductive organs of living Gnetales with a cone-like inflorescence that is organized by paired or decussate bracts.(3) For example, many pioneer trees exhibit orthotropic (vertically oriented) shoots that successively produce leaves in spiral or decussate phyllotaxy.(4) This plant resembles some trimerophytes, such as Pertica, in that it has three-dimensional branching with branches arranged in a spiral or decussate pattern.(5) The pyramids rapidly diminish in size at the level of the decussation, reflecting the fact that the great majority of corticospinal fibers leave the pyramids at the decussation .(6) The sensory decussation is the key feature of this section.(7) The central canal and surrounding gray matter appear as though pushed dorsally by the decussating bundles of axons.(8) The great majority of the pyramidal fibers which arise in the cerebral cortex and descend through the pyramids of the medulla cross in the decussation , most of the remainder forming the uncrossed ventral corticospinal tract.(9) After decussating , these fibers ascend in a compact, ribbon like tract called the medial lemniscus.(10) The brainstem has been cut through the inferior colliculi and the decussation of the superior cerebellar peduncles.(11) These decussating bundles can be seen distinctly between the lips of the ventral median fissure.(12) The trigeminal alone had a spinal root which wandered down for a few centimetres past the decussation of the pyramids to finish at the level of the second cervical nerve.
