ophthalmic t., optic t

The continuation of the optic nerves from the commi ure backward to the brain. At its connection with the brain each optic t. divides into two bands, which are Continued into the optic thalami, the corpora geniculata, and the corpora quadrigemina. peduncular t. A t. of nerve fibers in the crus cerebri, pyramidal t. A collection of nerve fibers in the spinal cord which may be traced from the point of origin of the lower sacral nerves upward in the posterior part of the lateral column to the lower part of the medulla oblong at a, where they cro to the opposite side, enter the pyramid, and may be followed through it and the pons to the corresponding crus cerebri. Many of the fibers do not decu ate, but run throughout their course in the anterior pyramidal t. respiratory t. The respiratory organs.