. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. ANATOMY OF THE NERVOUS SYSTEM. 345 766. The ganglia may be considered as distinct centres,giving off branches in four directions ; namely, the superior,or ascending, to communicate with the ganglion above ; theinferior, or descending, to communicate with the ganglionbelow ; the external, to communicate with the spinal nerves ;and the internal, to communicate with the sympathetic fila-ments. It is generally admitted that the nerves that pass fromthe ganglia are larger than those that entered them
. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. ANATOMY OF THE NERVOUS SYSTEM. 345 766. The ganglia may be considered as distinct centres,giving off branches in four directions ; namely, the superior,or ascending, to communicate with the ganglion above ; theinferior, or descending, to communicate with the ganglionbelow ; the external, to communicate with the spinal nerves ;and the internal, to communicate with the sympathetic fila-ments. It is generally admitted that the nerves that pass fromthe ganglia are larger than those that entered them ; as ifthey imparted to the nerve some additional power. 767. The branches of distribution accompany the arterieswhich supply the different organs, and form communicationsaround them, which are called plexuses, and take the nameof the artery with which they are associated. Thus we havethe mesenteric plexus, hepatic plexus, splenic plexus, &c. Allthe internal organs of the head, neck, and trunk, are suppliedwith branches from the sympathetic, and some of them exclu-sively ; for this reason,
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