A text book of physiology . f theeconomy. If, as later researches of Baxt3 woidd seem to shew, their acceler-ating effect is characterized not only by a diminution of the diastole 1 Schmiedeberg, Luchvigs Arbeitcn, 1871. 2 Baxt, Die Stellung des N. vagus mm N. accelcrans, Ludwigs Arbeitcn, 1S75. 3 Archiv f. Anat. u. Phys. 1878, p. 121. 176 ACCELERATOR NERVES. [Book i. bub also by an actual shortening of the cardiac systole, it is obviousthat the quickening of the hearts beat produced by their action issomething quite different from the quickening indirectly brought about bya diminution of the
A text book of physiology . f theeconomy. If, as later researches of Baxt3 woidd seem to shew, their acceler-ating effect is characterized not only by a diminution of the diastole 1 Schmiedeberg, Luchvigs Arbeitcn, 1871. 2 Baxt, Die Stellung des N. vagus mm N. accelcrans, Ludwigs Arbeitcn, 1S75. 3 Archiv f. Anat. u. Phys. 1878, p. 121. 176 ACCELERATOR NERVES. [Book i. bub also by an actual shortening of the cardiac systole, it is obviousthat the quickening of the hearts beat produced by their action issomething quite different from the quickening indirectly brought about bya diminution of the activity of the cardio-inhibitory centre. Baxt comparestheir action to that of heat directly influencing the cardiac tissues; and thecomparison is certainly a suggestive one. Many observers have obtained an acceleration of the hearts beats uponstimulation, under certain circumstances, of the trunk of the vagus. AndSchiff1 maintains that the accelerator nei^ves described above come from thevagus and not from the spinal n. vc/ff. Fig. 36. The last cervical and first thoracic ganglia in the rabbit. (Left side.)(Somewhat diagrammatic, many of the various branches being omitted.) Track. Trachea. Ca. carotid artery, sb. subclavian artery, n. Vag. the vagustrunk, n. rec. the recurrent laryngeal, sym. the cervical sympathetic nerve endingin the inferior cervical ganglion, gl. cerv. inf. Two roots of the ganglion are shewn,rad., the lower of the two accompanying the vertebral artery, A. vert., being theone generally possessing accelerator properties, gl. thor. pr. the first thoracic two branches communicating with the cervical ganglion surround the subclavianartery forming the annulus of Vieussens. sym. thor. the thoracic sympathetic dep. depressor nerve. This is joined in its course by a branch from the lowercervical ganglion, there being a small ganglion at their junction, from which proceednerves to form a plexus over the arch of the aorta. It
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