This section is from the book "Applied Anatomy: The Construction Of The Human Body", by Gwilym G. Davis. Also available from Amazon: Applied anatomy: The construction of the human body.
The direct or anterior pyramidal tract is motor; the impulse coming from the cerebral cortex passes down the spinal cord on the same side and thence to the anterior horn of the opposite side to supply mainly the muscles of the arm and trunk. The crossed or lateral pyramidal tract transmits motor impulses coming from the cortex which cross in the lower part of the medulla and descend on the opposite side. It supplies muscles on the same side as that on which the tract is. The direct cerebellar tract conveys impressions of equilibrium. The anterolateral tract (ascending tract of Gowers) conveys impressions of temperature and pain. The vestibulospinal tract - (descending tract of Lowenthal) is an indirect motor path.
Lissauer's tract is composed of ascending fibres from the posterior nerve-roots. The posterolateral (column of Burdach) conveys common sensation. The posteromedian (column of Goll) conveys muscular sense.
Motor paralysis below, spastic condition of paralyzed area; exaggerated reflexes; contractures; degeneration downward.
Sensory disturbances; ataxia; sensation of temperature and pain diminished; reflexes abolished; upward degeneration of postero-internal column.
Motor paralysis; muscle atrophy; reflexes abolished; degeneration descends and muscles show reaction of degeneration.
Sensory disturbances or anaesthesia, such as follows lesion of posterior column.
Same as anterior horn.
Anaesthesia, if complete J hyperalgesia and pain if irritative. Central Canal. - Painful and sensory impressions not properly recognized, while tactile or contact impressions are unaffected; joint dystrophies.
Brown-Sequard syndrome; complete loss of power below on the same side as lesion and slight loss of power below on opposite side; anaesthesia complete on opposite side below lesion.