pyramidal tracts


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Figure 1: The sites of the main nerve centres and descending pathways in the brain and spinal cord that control voluntary movement, represented in diagrammatic sections.

pyramidal tracts

the nerve pathways from the motor cortex of the brain to the motor neurons in the spinal cord (some direct but the majority via relay stations) that activate voluntary movements. Figure 1.

pyramidal tracts

principal central nervous system motor tracts, extending from the cerebral motor cortex to the contralateral ventral horn of the spinal cord, crossing from the ipsilateral to contralateral at the medulla (i.e. the decussation of the pyramids)

pyramidal

shaped like a pyramid.

pyramidal disease
abnormal growth of the wall of the hoof in the horse in which the vertical midline of the front of the hoof bulges, causing lameness. Caused by fracture of the extensor process of the third phalanx or by low ringbone.
pyramidal nervous system
pyramidal-shaped nerve cells in the cerebral cortex and their efferent neurons to skeletal muscles.
pyramidal tracts
collections of motor nerve fibers arising in the brain and passing down through the spinal cord to motor cells in the ventral horns.
References in periodicals archive ?
Comparison between motor evoked potential recording and fiber tracking for estimating pyramidal tracts near brain tumors.
Preoperative assessment of motor cortex and pyramidal tracts in central cavernoma employing functional and diffusion-weighted magnetic resonance imaging.
Intraoperative diffusion-weighted imaging for visualization of the pyramidal tracts.
Clinical evaluation and follow-up outcome of diffusion tensor imaging-based functional neuronavigation: a prospective, controlled study in patients with gliomas involving pyramidal tracts.
The mean distance between the stimulation sites and the DT-imaged fiber tracks varies from 2mm to 1cm in the pyramidal tract [3,16,18,24] and to visualize language-related subcortical connections, such as the arcuate fasciculus (AF) distances between the stimulus points and the AF were within 6 mm [10].
3 Tesla) has been developed demonstrating clinical usefulness and efficacy in detecting the pyramidal tract and its relationship with tumor borders [26].
Diffusion-tensor imaging-guided tracking of fibers of the pyramidal tract combined with intraoperative cortical stimulation mapping in patients with gliomas.
Intraoperative three-dimensional visualization of the pyramidal tract in a neuronavigation system (PTV) reliably predicts true position of principal motor pathways.
Three-dimensional visualization of the pyramidal tract in a neuronavigation system during brain tumor surgery: first experiences and technical note.