Cerebral Hemisphere

Diagram of the motor tract as shown in a diagrammatic horizontal section through the cerebral hemispheres Crura, Pons, and Medulla. Fr., frontal lobe; Oc., occipital lobe; AF., ascending frontal, AP., ascending parietal convolutions; PCF., pre-central fissure in front of the ascending frontal, AP., ascending parietal convolution; FR., fissure of Rolando; IPF., interparietal fissure, a section of crus is lettered on the left side. SN., substantia nigra; Py., pyramidal motor fiber, which on the right is shown as continuous lines converging to pass through the posterior limb of IC. internal capsule ( the knee or elbow of which is shown thus) upwards into the hemisphere and downwards through the pons to cross the medulla in the anterior pyramids.

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