TRACT

direct pyramidal tract it makes up the anterior column of the spinal cord. Called also principal t. Foville’s t., the direct cerebellar tract of the spinal cord. frontopontine t., a tract of fibers arising from the pons varolii, and extending antetiorly to form part of the cerebral peduncle. genitot., the genito-urinary organs in continuity. Goll’s t., fasciculus gracilis. Gowers’ ὕ. 1. A tract contained within the lateral medullary tract, and believed to ters minate in the lateral nuclei of the oblong at a. 2. One of the ascending or sensory tracts of the spinal cord. habenular t., a tract of fibers pa ing from the habenula to the mesial side of the red nucleus. Helweg’st. Same as olitos pinal t. intermediolateral t., the intermediate proce of Gowers; the lateral gray cornu of the cord. lateral medullary t., a fillet in the most lateral portion of the reticular field. Li auer’s t., a narrow zone of white substance between the periphery of the spinal cord and its dorsal horn. Called also Spitska’s t. and marginal bundle. Liwenthal’s t., the descending or motor tract in the spinal cord. lymph-t., a lymph-space, or system of lymph-spaces, as in the brain. Marchi’s t. Same as Lowenthal’s |. marginal t., cro ed. Same as Li auer's t. me sen cep halo spinal t. Same as pre pyramidal t. mixed lateral t., a tract of the spinal cord believed to contain both motor and sensory elements. Monakow’s t., the pre pyramidal tract. motor t., the path of a motor impulse going from the brain to a muscle. olfactory t., the narrow portion of the olfactory lobe of the brain; the rhinencephalon. olivospinal t., a cro ed tract extending from the olivary body to the motor cells of the anterior horn. ophthalmic t., optic t., the fibers between the visual centers and the optic chiasm. optic t., intracerebral. See sagittal medullary t. pre pyramidal t., one of the descending tracts of the anterolateral column, being a triangular area in the lateral columns, between the cro ed pyramidal tract and the tract of Gowers. Called also 3fonakow’s bundle, fasciculus inter me diol at era lis, and rubrospinal t. principal t. See Flechstg’s 1. pyramidal t., the continuation in the spinal cord of the ventral pyramids of the oblong at a, forming the great pathway of motor influences in the crustal portion of the crura and pons. pyramidal t., cro ed, a motor or descending tract in the lateral columns of the spinal cord. pyramido-anterior t. Same as column of Tiirck. pyramidolateral t., the cro ed pyramidal tract. respiratory t., the respiratory organs in continuity. rubrospinal t. Same as epyromidal |, sagittal t., sagittal medult., a tract of the brain coming from the posterior third of the posterior limit of the internal capsule. Called also intracerebral optic t. Schultze’s t. Same as com me-t. lunar t., a tract of nerve-fibers in the white matter of the. cerebellar hemisphere. sensory t., any tract of nerve-fibers conveying sensory impulses. sep to margin alt. See Fiechsig’s!. spinomuscular t., the motor cells of the oblong at a and of the spinal cord, and the nerve-fibers which originate in them. spino-olivary t. Same as olitespinal t. Spitzka’s t. Same as Li auer's t. sulcomarginal t. Same as (ectospinul. sylvian t., the region of the brain about the sylvian fi ure. tec to spinal t., a system of fibers arising in the corpora quadrigemina and extending into the spinal cord. tegmental t., a tract of fibers in the tegmentum, back of the superior olivary body, believed to connect the latter with the midbrain. tegmental t., central, a tract that begins near the dorsal acce ory nucleus and pa es cephalad in the mid tegmentum. temporocentral t., the structure that connects the temporal lobe with the central convolution. temporocerebellar t., a tract of white fibers from the cortex of the temporal lobe to the cortex of the frontal lobe. tem- porofrontal t., the structure which connects the temporal and frontal lobes. temporopontine t. Same as Tiirck's bundle, under bundle. Tiirck’s direct pyramidal t., a descending motor tract in the ventral region of the myelon. urinary t., the pa age from the kidney to the urinary meatus. uveal t., the iris, ciliary body, and choroid considered together. vestibulospinal t., a tract of fibers in the anterolateral ground-bundle of the cord in front of the pre pyramidal tract.