Principles and practice of spinal adjustment; for the use of students and practitioners . 1. The first, second, third and fourth cervical spinalnerves influence the heart as a result of their following con-nections : They communicate with the superior cervicalganglion which sends a branch to the vagus; the branches ofthe vagus which supply the heart are the cervical cardiacbranches which arise from it at the upper and lower partof the neck; the superior branch connects with the cardiacbranches of the sympathetic; the inferior branch communi-cates with the superficial cardiac plexus. The thorac
Principles and practice of spinal adjustment; for the use of students and practitioners . 1. The first, second, third and fourth cervical spinalnerves influence the heart as a result of their following con-nections : They communicate with the superior cervicalganglion which sends a branch to the vagus; the branches ofthe vagus which supply the heart are the cervical cardiacbranches which arise from it at the upper and lower partof the neck; the superior branch connects with the cardiacbranches of the sympathetic; the inferior branch communi-cates with the superficial cardiac plexus. The thoracic cardiacbranches arise from the trunk of the vagus and end in thedeep cardiac plexus. The superior cardiac is one of the internal branches of thesuperior cervical ganglion of the sympathetic; it receives afilament from the cord of communication between the upperand middle cervical ganglia. The deep cardiac plexus is formed by the cardiac nervesderived from the cervical ganglia of the sympathetic and thecardiac branches of the recurrent laryngeal and vagus. 135 136 SPINAL ADJUSTMENT. Fig. 23. Iarts Influenced by the FifthDorsal Nerve. ORGANS OF THE THORAX 137 The superficial cardiac plexus is formed by the left supe-rior cardiac nerve, the left (and occasionally the right) infe-rior cervical cardiac branches of the vagus, and filamentsfrom the deep cardiac plexus. A small ganglion, the cardiacganglion of Wrisberg, is sometimes found connected withthese nerves at their point of junction. These plexuses supplythe surface and substance of the heart. The superior cardiac nerve, above referred to, dividesinto two branches: the right superior cardiac nerve at aboutthe middle of the neck receives filaments from the externallaryngeal nerve; lower down, one or two twigs from thevagus; and as it enters the thorax it is joined by a filamentfrom the recurrent laryngeal. Filaments from this nervecommunicate with the thyroid branches from the middlecervical ganglion. The left superior cardi
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