decussate

(de-kus’it) [L. decu a’re to cro in the form of an X]. 1. To cro or intersect in the form of the letter Χ. 2. Cro ing in the form of the letter X. Gecu atio (de-kus-a’she-o) [L.]. Decu ation. d. brachii conjunct i’vi, a cro ing of the fibers To re- To explode with a of the tegmenta starting from the brachia conjunctiva. d. lemnis’ci, d. lemnisco’rum, the superior pyramidal decu ation. d. pyram’idum. See decu ation of the pyramids. decu ation (de-kus-a’shun) [L. decu a’tio]. 1. The running of two fellow-parts or structures athwart cach other; a chiasm, 2. The point of cro ing of decu ate parts. fillet d., a cro ing of nerve-fibers over the median line in the medulla oblong at a, forming the fillet. Forel’s d., the ventral part of the fountain decu ation. found., a decu ation such as that of the nerve fibers in the cortex of the anterior corpora quadrigemina. motor d., the decu ation of the amids. optic d., the optic chiasm. p form d., the superior pyramidal decu ation. d. of the pyramids, the cro ing of the fibers of the pyramids of the oblong at a from one pyramid to another. sensory d., the superior pyramidal decu ation. superior p; ., the chiasm in front of the central canal of the oblong at a, of fibers from the nucleus cuneatus and nucleus gracilis.