. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. AVES. 303 the thorax, where it sends a considerable branch from the first thoracic ganglion to join the pul- monary plexus formed by the par vagum. This ganglion also distributes seven other fila- ments, one of which goes to join the brachial plexus; a second is lost in the cardiac plexus of the par vagum ; three other filaments proceed inwardly to the projectioTi formed by the bodies of the vertebrae to produce the commencement of the splanchnic nerve; lastly, the sixth and seventh serve to unite the first ganglion with
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. AVES. 303 the thorax, where it sends a considerable branch from the first thoracic ganglion to join the pul- monary plexus formed by the par vagum. This ganglion also distributes seven other fila- ments, one of which goes to join the brachial plexus; a second is lost in the cardiac plexus of the par vagum ; three other filaments proceed inwardly to the projectioTi formed by the bodies of the vertebrae to produce the commencement of the splanchnic nerve; lastly, the sixth and seventh serve to unite the first ganglion with the second, one passing above, the other below the head of the rib, which they thus include in a lozenge-shaped space. Each of the succeed- ing ganglions forms, in like manner, a centre of nervous radiations, which are five, six, or seven in number, of which four, two anterior and two posterior, serve to bring the contiguous ganglia into communication with each other; one or two contribute to the formation of the splanch- nic nerve, and one joins the dorsal spinal nerve situated immediately behind the ganglion. The splanchnic nerves, formed by all the in- ternal thoracic branches of the great intercostal, accompany on either side the trunk of the aorta. When it has arrived at the cceliac axis, they surround it and form one, two, or three ganglions from which an immense number of filaments are thrown off, which surround the different arteries of the abdomen. These gang- lions are evidently the analogues of the semi- lunar ganglions of man, and the filaments pro- ceeding from them correspond to the solar plexus. The trunk of the sympathetic con- tinues along the bodies of the vertebrae, but the ganglions become less marked after the ribs cease to be given off; two or three filaments are given off from each of these small swell- ings, which, by uniting with the filaments of the opposite side, form a plexus around the aorta. The termination of the sympathetic may be readily trace
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