Anatomy Atlases: Illustrated Encyclopedia of Human Anatomic Variation: Opus III: Nervous System: Variations in Crossing Pattern of Pyramids in Medulla and Subsequent Formation of Corticospinal Tracts in Spinal Cord.

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Illustrated Encyclopedia of Human Anatomic Variation: Opus III: Nervous System

Variations in Crossing Pattern of Pyramids in Medulla and Subsequent Formation of Corticospinal Tracts in Spinal Cord.

Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed

Pyramidal tracts in spinal cords of 144 human fetal or neonatal specimens. Although the commonest pattern (A) is shown in the diagram as bilaterally symmetrical, the pyramidal tracts were 'patently unequal' in 81 of these 103 specimens." The illustration F was not encountered in the study of 144 brains and may not be associated with viable individuals. SPCS, specimens.

Redrawn from Sweet, WH. Recent observations pertinent to improving anterolateral cordotomy. Clin. Neurosurg. 23:80-95, 1976.

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