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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.

Cerebral Hemisphere

Diagram of the motor tract as shown in a diagrammatic horizontal section through the cerebral hemispheres…

Transverse section through the mesencephalon at the level of the inferior quadrigeminal body.

Section of Mesencephalon at Inferior Quadrigeminal Body

Transverse section through the mesencephalon at the level of the inferior quadrigeminal body.