has part has part characteristic of part of inheres in part of has modifier Abnormal pyramidal tract morphology Abnormal corticospinal tract morphology HP:0002492 HP:0006912 Abnormality of the corticospinal tract, which is the chief element of the pyramidal system (the principle motor tract) and is the only direct connection between the cerebrum and the spinal cord. Involvement of the corticospinal pathways Morphological abnormality of the corticospinal tract Abnormality of the corticospinal tract UMLS:C4020852 UMLS:C4025704 morphology abnormal corticospinal tract