. Anatomy, descriptive and applied. Anatomy. THE CEREBRAL HEMISPHERES 957 and end, contralaterally, in relation with the facial and hypoglossal nerve nuclei (also called the emissary speech tract). The corticospinal division arises from the remainder of the motor area, courses throuoh the frontal two-thirds of the posterior limb of the internal capsule, through crusta, pons, and medulla oblongata, to form the pyramids, and, under- going partial decussation, forms the direct and the crossed pyramidal tracts described in the spinal cord. (h) The frontopontile tract {Arnold's bundle) arises in th
. Anatomy, descriptive and applied. Anatomy. THE CEREBRAL HEMISPHERES 957 and end, contralaterally, in relation with the facial and hypoglossal nerve nuclei (also called the emissary speech tract). The corticospinal division arises from the remainder of the motor area, courses throuoh the frontal two-thirds of the posterior limb of the internal capsule, through crusta, pons, and medulla oblongata, to form the pyramids, and, under- going partial decussation, forms the direct and the crossed pyramidal tracts described in the spinal cord. (h) The frontopontile tract {Arnold's bundle) arises in the midfrontal cortex, courses through the internal capsule (caudal part of frontal limb), forms the mesal sector (one-fifth) of the crusta, and ends in the nuclei pontis. (c) The temporopontile tract {Tiirck's bundle) arises in the cortex of the tem- poral lobe, descends through the internal capsule (caudal segment), forms the ectal (one-fifth) sector of the crusta, and ends in the nuclei pontis. The existence of occipitopontile fibres is denied by Archambault in a recent contribution (1906). (d) The occipitomesenceph{ilic tract arises in the visual area (cuneus and cal- carine formation), courses through the retrolenticular part of the internal capsule, to end in the superior quadrigeminal body and in relation with the nuclei for move- ments of the eyeball. (e) Part of the fibres composing the optic radiation are corticipetal, arising in the occipital cortex and ending in the pulvinar of the thalamus and the external geniculate body. GRANULE. Fig. 71S.—Schema of the olfactory bulb and tract neurones. 2. Ascending (corticipetal) tracts arise mostly from the nuclei of the thalamus and hj'pothalamus, mid-brain, and cerebellum. (a) The terminal or cerebral part of the general sensor pathway of the body comprises the axones arising in the cells of the lateral nucleus of the thalamus and the hypothalamic nucleus—interposed way-stations which transfer the im- pressions carried alo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
