Atlas and Textbook of Human Anatomy

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ...oj lenticular nucleus Red nucleus oj tegmentum Tail oj caudate nucleus Nucleus oj medial geniculate body Inferior horn oj lateral ventricle Posterior horn ojj lateral ventrich Hippocampus Transverse fissure oj cerebrum Radiation oj corpus callosum occipital portion) bi bl TM Cerebellum Fig. 674.--A horizontal section of the brain. Upon the left side the section passes through the thalamus; upon the right, one centimeter deeper, through the corpora quadrigemina and the hypothalamic nucleus. In the left internal capsule are indicated the chief fasciculi of the corona radiata; the motor tracts are red (including the motor cerebral nerves); the sensory tracts blue, especially the cerebropontile tracts; the occipitothalamic radiation, violet. The frontal cerebropontile tract and the optic radiation are shown as far as their radiation into the cerebral cortex. and the medulla oblongata to the pyramidal decussation. Here an incomplete decussation takes place, the main mass of fibers passing on the opposite side of the cord and terminating at different levels in the anterior gray column of that side, while a smaller, uncrossed part remains on the original side as the anterior pyramidal tract (see page 116), and later on undergoes a crossing in the anterior white commissure. (b) The corticobulbar tract has its origin (so far as is known) in the lower portion of the central convolutions, passes through the genu of the internal capsule and through the base of the cerebral peduncle to the various nerve nuclei situated in the opposite side of the medulla. Decussation oj pyramids Fig. 675.--Certain tracts of the brain, particularly of the corona radiata, introduced into an outline of Fig. 642. The pyramidal tracts are red; the cerebropontile and central tegmental tracts ...