. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. THE CIRCULATION OP THE BLOOD. 259 their course in a general way, without special reference to the variations for each animal group: 1. These nerves emerge from the spinal eord (upper dorsal region), and proceed upward ff^ I Accelerator Center in Me- 1 ^^„^^ Superior Cervical Ganglion. Spinal Middle Cervical Ganglion. Inferior Cervical Ganglion. Baaal Ganglion in Region of FiTBt Kib. Accelerator Nerves. Heart. Fig. 217.—Biagram to illustrate tlie origin, c
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. THE CIRCULATION OP THE BLOOD. 259 their course in a general way, without special reference to the variations for each animal group: 1. These nerves emerge from the spinal eord (upper dorsal region), and proceed upward ff^ I Accelerator Center in Me- 1 ^^„^^ Superior Cervical Ganglion. Spinal Middle Cervical Ganglion. Inferior Cervical Ganglion. Baaal Ganglion in Region of FiTBt Kib. Accelerator Nerves. Heart. Fig. 217.—Biagram to illustrate tlie origin, course, etc., of accelerator impulses. It will be undei-stood that this is intended to indicate the general plan, and not pre- cisely what takes place in any one animal. Thus, while the accelerator nerves may arise in this way, it is not meant to be implied that the heart is actually sup- plied by three nerves of such origin in any case. The arrows, as before, indicate the path of the impulses. before being distributed to the heart. 2. They may leave for their cardiac destination either at (a) the first thoracic (or basal cardiac ganglion, as it might be named in this case), (6) the in- ferior cervical ganglion, (c) the annulus of Vieussens, or (d) the middle cervical ganglion. It follows that the heart may be made to do increased work in three ways : First, the relaxation of a normal inhibitory. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mills, Wesley, 1847-1915. New York, Appleton
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