Pyramidal tract lesions

Introduction The original reflection that occurs for upper motor neuron damage. Mainly refers to a network system of vertebral cells in the cerebral cortex and its axons (like tentacles) and the spinal cord, mainly governing limbs and trunk movement. When the pyramidal tract is damaged, it loses its inhibitory function on the brainstem and spinal cord and releases the reflex effect of the tendon and the toe back. The above-mentioned reflection phenomenon may occur in infants and young children within 1 year and a half because the pyramidal tract is not yet fully developed. Adult patients, if present, are pathological reflexes. Including: Babinski sign, Oppenheim sign, Gorden sign, Chaddock sign, Gonda sign, Hoffmann sign.

Cause

The pyramidal bundle includes both the corticospinal tract and the cortical brainstem bundle. Because the nerve fibers mainly originate from the pyramidal cells of the cerebral cortex, they are called pyramidal bundles. After leaving the cerebral cortex, the pyramidal tract moves through the inner capsule and the cerebral pedicle to the medulla (most of the nerve fibers cross the contralateral medulla to the contralateral side, and enter the lateral column of the spinal cord), and finally the anterior horn of the spinal cord moves. Upper motor neuron paralysis (also known as central paralysis or tonic paralysis) and pyramidal tract signs often occur in lesions.

an examination

Related inspection

Auburnham levy Huffman to investigate the Dok sign of the abdominal wall

One side of the vertebral body beam positive represents the ipsilateral vertebral body bundle injury or the damage of the high center. When bilaterally positive, the lower motor neuron conduction path lesions, bilateral metastasis was lost. When one side of the vertebral body beam is positive, it is necessary to perform a motion sensation test, and to determine the position of the lesion with qualitative positioning. The vertebral body beam is positive in children under 1 year old, and all other ages are abnormal.

Differential diagnosis

It should be noted that the above-mentioned reflection phenomenon may occur in infants and young children within 1 year and a half because the pyramidal tract is not yet fully developed. The situation in adults is pathological.

One side of the vertebral body beam positive represents the ipsilateral vertebral body bundle injury or the damage of the high center. When bilaterally positive, the lower motor neuron conduction path lesions, bilateral metastasis was lost. When one side of the vertebral body beam is positive, it is necessary to perform a motion sensation test, and to determine the position of the lesion with qualitative positioning. The vertebral body beam is positive in children under 1 year old, and all other ages are abnormal.

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