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Vertical section through the cerebrum and basic ganglia to show the relation of the latter. Labels: co, cerebral convolutions; c, corpus callosum; v.l., lateral ventricle; f, fornix; vIII., third ventricle; n.c., caudate nucleus; th, optic thalamus; n.l., lenticular nucleus; c.i., internal capsule; c.l., claustrum; c.e., external capsule; m, corpus mammillare; t.o., optic tract; s.t.t., stria terminalis; n.a., nucleus amygdala; cm, soft commissure.

The Cerebrum and Basic Ganglia of the Brain

Vertical section through the cerebrum and basic ganglia to show the relation of the latter. Labels:…

Diagram to show the relative position of several motor tracts in their course from the cortex to the crus. The section through the convolutions is vertical; that through the internal capsule, I, C, horizontal; that through the crus again vertical. C, N, caudate nucleus; O, H, optic thalamus; L2 and L3, middle and outer part of lenticular nucleus; f, a, l, face, arm, and leg fibers. The words in italic indicate corresponding cortical centers.

Motor Tracts of the Brain

Diagram to show the relative position of several motor tracts in their course from the cortex to the…

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…

Diagram of the projection fibers of the cerebrum. Labels: B, motor (pyramidal) tract; C, body-sense tract; D, visual tract; E, auditory tract; F, G and H, upper, middle and lower peduncles of cerebellum; K, decussation of pyramids. Numerals refer to cranial nerves.

Projection Fibers of the Cerebrum

Diagram of the projection fibers of the cerebrum. Labels: B, motor (pyramidal) tract; C, body-sense…