. Cunningham's Text-book of anatomy. Anatomy. PARTS DERIVED FROM THE DIENCEPHALOK 613 External capsule ventral stalk streams out from the under aspect of the anterior part of the thalamus, in front of the hypothalamic tegmental region and the corpus mamillare. Its fibres arise in both the medial and lateral nuclei, and sweep downwards and laterally to reach the region below the lentiform nucleus. One very distinct band which lies dorsal to the other fibres (ansa lenticu- laris) comes from the lentiform nucleus to the thalamus, whilst the remainder (ansa peduncularis) proceed in a lateral direc
. Cunningham's Text-book of anatomy. Anatomy. PARTS DERIVED FROM THE DIENCEPHALOK 613 External capsule ventral stalk streams out from the under aspect of the anterior part of the thalamus, in front of the hypothalamic tegmental region and the corpus mamillare. Its fibres arise in both the medial and lateral nuclei, and sweep downwards and laterally to reach the region below the lentiform nucleus. One very distinct band which lies dorsal to the other fibres (ansa lenticu- laris) comes from the lentiform nucleus to the thalamus, whilst the remainder (ansa peduncularis) proceed in a lateral direction from the thalamus below the lentiform nucleus and gain the cortex of the temporal lobe and of the insula. Flechsig divides the thalamo-cortical fibres of ordinary sensation into three sensory systems. These he has been able to distinguish by studying the order in which they assume their sheaths of myelin in the foetus and infant. Ferrier and Turner, by the degenerative method of investigation, corroborate Flechsig's results. They confirm the observation of Flechsig that, while thalamic fibres are distributed to the several regions of the cerebral cortex to an almost equal extent, there is one district, viz., the frontal pole, to which the supply is scanty. Another very important result has been obtained by these authors. They have established the fact that many of the thalamic fibres cross the median plane in the corpus callosum, and^ thus gain the cortex of the opposite cerebral hemisphere. Hamilton's crossed callosal tract thus receives confirmation. Intimate Structure of the Corpus Geniculatum Laterale.—Sections through the lateral geniculate body reveal the fact that it is composed of a series of alternately- placed gray and white curved laminae. This gives it a very characteristic ap- pearance. The white laminae are composed of fibres which enter the body from the optic tract. The connexions of the geniculate bodies will be studied with the optic tract. Hypothala- m
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
