pyramidal system

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pyramidal system

[¦pir·ə¦mid·əl ′sis·təm]
(anatomy)
The corticospinal and corticobulbar tracts.
References in periodicals archive ?
Diffusion tensor imaging detects Wallerian degeneration of the corticospinal tract early after cerebral infarction.
sending the message via the corticospinal tracts to a limb
The syndrome is characterized by motor paralysis at and below the level of the spinal cord injury due to interruption of the corticospinal tract that courses through the lateral funiculus of the spinal cord, while sensory paralysis occurs on the opposite side when either half of the spinal cord is disrupted.
TMS is a noninvasive exploration designed to assess corticospinal tract dysfunctions by recording specific parameters such as the central motor conduction time (CMCT), while evaluating the motor threshold and the amplitude of the so-called motor evoked potential (MEP).
It has been suggested that this method is not sensitive enough, as subtle deficits in the corticospinal tract, which may result in postoperative motor deficits, may not be detected.
Possibly affected' members are asymptomatic at- risk subjects who have a normal gait but who show possible corticospinal tract deficits on examination (mild hyper-reflexia a few beats of unsustained ankle clonus but with flexor plantar responses).
During voluntary movement, multiple descending volleys are generated in the corticospinal tract, which travel from the motor cortex down to the spinal cord.
MRI brain showed hyperintensity in bilateral corticospinal tract in the region of internal capsule which was classical of ALS.
Corticospinal tract damage accompanies motor dysfunction in a mouse model of closed-head mild traumatic brain injury.
Diffusion tensor tractographic (DTT) studies have shown that the corticospinal tract passes through the posterior half of the PVWM, the arm-hand region being centered roughly at the junction of the middle and posterior thirds on scans aligned along the AC-PC line [25].
It is anticipated that such discharges are asymptomatic prior to, but are manifested by epileptic jerks upon the formation of the corticospinal tract.
The axons arising from the large pyramidal cells in layer V (Betz's cells) of area 4 contribute only about 5% of the fibers of the corticospinal tract and its pyramidal portion.