The anatomist's vade mecum : a system of human anatomy . s principalbranches divided near theirorigin. 4. The arteria innomi-nata, dividing into the rightcarotid and right subclavian ar-teries. 5. The left carotid. 6. The left subclavian. 7. Thesuperiorcava, formed by the union of, 8, the twovense innominatse ; and these by the junction, 9, of the internal jugular andsubclavian vein at each side. 10. The greater vena azygos. 11. The termi-nation of the lesser in the greater vena azygos. 12. The receptaculum chyli;several lymphatic trunks are seen opening into it. The thoracic duct,dividin
The anatomist's vade mecum : a system of human anatomy . s principalbranches divided near theirorigin. 4. The arteria innomi-nata, dividing into the rightcarotid and right subclavian ar-teries. 5. The left carotid. 6. The left subclavian. 7. Thesuperiorcava, formed by the union of, 8, the twovense innominatse ; and these by the junction, 9, of the internal jugular andsubclavian vein at each side. 10. The greater vena azygos. 11. The termi-nation of the lesser in the greater vena azygos. 12. The receptaculum chyli;several lymphatic trunks are seen opening into it. The thoracic duct,dividing opposite the middle of the dorsal vertebrse into two branches whichsoon reunite; the course of the duct behind the arch of the aorta and leftsubclavian artery is shown by a dotted line. 14. The duct making its turnat the root of the neck and receiving several lymphatic trunks previously toterminating in the posterior aspect of the junction of the internal jugularand subclavian vein. 15. The termination of the trunk of the ductus lynj-phaticus 394 CHAPTEK THE NERVOUS SYSTEM. The nervous system consists of a central organ, the cerebro-spinalcentre or axis, and of numerous rounded and flattened white cords,the nerves, which are connected by one extremity with the cerebro-spinal centre, and by the other are distributed to all the textures ofthe body. The sympathetic system is an exception to this description;for in place of one it has many small centres which are called ganglia,and which communicate very freely with the cerebro-spinal axis andwith its nerves. The cerebro-spinal axis consists of two portions, the brain, an organof large size, situated within the skuU, and the spinal cord, a length-ened portion of the nervous centre continuous with the brain, andoccupying the canal of the vertebral column. The most superficial examination of the brain and spinal cord showsthem to be composed of fibres, or rather fasciculi, which in some situ-ations are ranged in a
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