A text-book of physiology . vical ganglion, the two forming the vago-sympathetictrunk. As this trunk enters the thorax, the sympathetic portion bearsa ganglion () usually called the lower cervical ganglion. To thisganglion there pass from the stellate ganglion () of the thoracicsympathetic chain, two nerves, one running ventral to, the other dorsalto the subclavian artery, and thus forming with the two ganglia, theannulus of Vieussens (). A very large number of the cardiac nerves spring from the lowercervical ganglion and from the vagus trunk lying in contact with it,from the vag
A text-book of physiology . vical ganglion, the two forming the vago-sympathetictrunk. As this trunk enters the thorax, the sympathetic portion bearsa ganglion () usually called the lower cervical ganglion. To thisganglion there pass from the stellate ganglion () of the thoracicsympathetic chain, two nerves, one running ventral to, the other dorsalto the subclavian artery, and thus forming with the two ganglia, theannulus of Vieussens (). A very large number of the cardiac nerves spring from the lowercervical ganglion and from the vagus trunk lying in contact with it,from the vagus trunk belovv this ganglion, from the annulus of Vieus-sens, chiefly at least from the ventral limb, and sometimes from thestellate ganglion. There are besides cardiac branches passing fromthe vago-sympathetic trunk between the levels of the superior andof the inferior cervical ganglia, cardiac branches of the recurrentlaryngeal, a cardiac branch of the superior laryngeal, and a long Chap. IV.] THE VASCULAR MECHANISM. 315. Fig. 72. Diagrammatic Representation^ of the Cardial Inhibitort andaugmentor flbres in the dog. fibres The upper portion of the figure represents the inhibitory, the lower the auo-iueutor 316 AUGMENTOE FIBEES IN MAMMAL. [Book i. r. Vg. roots of the vagus. roots of the spinal accessory; both drawnvery diagrammatically. ganglion jugulare. ganglion trunci spinal accessory trunk. external spinal accessory, spinal accessory. Vg. trunk of vagus nerve, branches going toheart. cervical sympathetic. loAver cervical ganglion. sub-clavian artery. Annulus of Vieussens. , stellate ganglion, correspond-ing to the first, second, and third ganglia of the thoracic chain. ^, ^,fourth and fifth thoracic ganglia. , , , , , first, second, third,fourth and fifth thoracic spinal nerves, r. c. ramus communicans. n. c. nerves(cardiac) passing to the heart
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