Anatomy, physiology and hygiene . egion, theupper extremities are also paralyzed, for the cord isdamaged above the point at which the nerves distributedto them are given off. Sometimes injuries to the spineresult in loss of power only or sensation only; but, ifsevere, the parts below are deprived of both sensation andvoluntary motion. 321. The Sympathetic Nervous System consists of a doublechain of ganglia on the sides of the spinal column. Theseganglia are connected with one another by nerves, and withthe cerebro-spinal nervous system by motor and sensitivefibres. From them numerous and very
Anatomy, physiology and hygiene . egion, theupper extremities are also paralyzed, for the cord isdamaged above the point at which the nerves distributedto them are given off. Sometimes injuries to the spineresult in loss of power only or sensation only; but, ifsevere, the parts below are deprived of both sensation andvoluntary motion. 321. The Sympathetic Nervous System consists of a doublechain of ganglia on the sides of the spinal column. Theseganglia are connected with one another by nerves, and withthe cerebro-spinal nervous system by motor and sensitivefibres. From them numerous and very delicate fibres are 1 Many fibres passing to and from the cerebral cortex pass through thebasal ganglia. Of these, the optic thalami (one in each hemisphere) arebelieved to be sensory centres, and the corpora Striata (one in each hemi-sphere), motor centres. 2 Such paralysis is called paraplegia, while that which results in oneside of the body, from injury to one cerebral hemisphere, is known ashemiplegia. 296 THE XERVOUS Fig. 97. Vertical section of body, showing sympathetic nerves and ganglia of right side, and theirconnection with the cerebrospinal nerves.— Cerebrospinal system: CN, cervicalnerves ; B, nerves distributed to the arm ; D57, dorsal nerves ; SN, sacral nerves, someof which are distributed to the leg ; PN, pneumogastric nerve. Sympathetic system.:P, plexus in the head ; PP, pharyngeal plexus ; CP, cardiac plexus ; OP, oesophagealplexus ; SoP, solar plexus ; AP, aortic plexus ; MP, mesenteric plexus ; SP, sacralplexus ; G, some of the ganglia of the sympathetic system. THE NERVOUS SYSTEM. 297 distributed, chiefly to the alimentary canal and its append-ages, the heart, blood-vessels, and certain other various points the sympathetic nerves, with theirganglia, form matted nets, or plexuses, about certainlarge arteries. A typical one is the solar plexus, so calledbecause its radiating nerves branch out like the solar is situated in the
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