. Cunningham's Text-book of anatomy. Anatomy. 612 THE NEEVOUS SYSTEM. From the lateral nucleus by far the greatest number of the fibres which form the radiatio thalami pass, and these are seen crossing it in various directions towards the lamina medullaris externa. The anterior nucleus (nucleus anterior thalami) is the smallest of the three thalamic nuclei. It forms the prominent anterior tubercle, and is prolonged in a wedge-shaped manner, for a short distance, downwards and backwards between the anterior parts of the medial and lateral nuclei. The internal medullary lamina splits into two pa
. Cunningham's Text-book of anatomy. Anatomy. 612 THE NEEVOUS SYSTEM. From the lateral nucleus by far the greatest number of the fibres which form the radiatio thalami pass, and these are seen crossing it in various directions towards the lamina medullaris externa. The anterior nucleus (nucleus anterior thalami) is the smallest of the three thalamic nuclei. It forms the prominent anterior tubercle, and is prolonged in a wedge-shaped manner, for a short distance, downwards and backwards between the anterior parts of the medial and lateral nuclei. The internal medullary lamina splits into two parts and partially encloses the anterior nucleus. In connexion with its large cells a very conspicuous bundle of fibres, the fasciculus thalamomamillaris, comes to an end. As this bundle arises in the corpus mamillare, it ought to be called " fasciculus ; A diffuse gray mass imperfectly marked off from the inferior surface of the lateral nucleus receives the name of the ventral nucleus. Its inferior part is composed of the central nucleus of Luys and the nucleus arcuatus. In section the former appears as a circular mass of gray matter, â which comes into view immediately behind the point where the internal medullary lamina disappears. It would seem to be intimately connected with fibres which reach it from the red nucleus and from the posterior commissure. These fibres pass round it so as to mark it off from the rest of the thalamus, and in front of the nucleus many of them enter the internal medullary lamina. The nucleus arcuatus is a small semilunar mass of gray matter placed below and to the lateral side of the central nucleus of Luys. The connexions of the thalamus are of an extremely intricate kind. It would appear to be a ganglionic mass interposed between the tegmental corticipetal tracts and the cerebral cortex. In its posterior part, and through its stratum zonale, it also has important connexions with the optic tract. The corticipetal tegm
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