Principles and practice of spinal adjustment; for the use of students and practitioners . anatomically,but clinical evidence bears out the connection. We knowthat the tenth dorsal nerves markedly influence the kidneys,and clinically we very often meet with visual troubles invarious diseases of the kidneys. The only connection thatexists between the tenth pair of thoracic nerves with theoptic nerves is through the communication of the formerwith the terminal fibres of the phrenic, which in turn is derivedpartly from the fourth cervical nerve, which we have seenhas so powerful an influence upon
Principles and practice of spinal adjustment; for the use of students and practitioners . anatomically,but clinical evidence bears out the connection. We knowthat the tenth dorsal nerves markedly influence the kidneys,and clinically we very often meet with visual troubles invarious diseases of the kidneys. The only connection thatexists between the tenth pair of thoracic nerves with theoptic nerves is through the communication of the formerwith the terminal fibres of the phrenic, which in turn is derivedpartly from the fourth cervical nerve, which we have seenhas so powerful an influence upon vision. 7. The first and second lumbar nerves also have a some-what obscure yet decided influence upon the eyes. Thereader must constantly bear in mind that clinical phenomenaare very often met with for which there is no positive ex-planation, yet which are sufficient to prove that a connectionexists between certain nerves, even though they cannot betraced anatomically. The Innervation of the Ear.—The innervation of the ear isderived from the following ner^^es: 122 SPINAL ADJUSTMENT. Parts Influenced by the SixthCervical Nerve. CRANIUM, FACE AND NECK 123 1. The auditory nerves, which receives a branch from thegeniculate ganglion, which communicates with the superiorcervical ganglion through the external petrosal nerve. Italso connects with the upper thoracic spinal nerves throughthe connection of the continuous ascending fibres of whiterami communicantes with the superior cervical it is that the upper cervical and upper dorsal segmentsinfluence to such a marked degree the ear. 2. The first four cervical spinal nerves unite with andinfluence the ganglia which supply the auditory the medium of the recurrent nerve to the tentoriumthey also afifect the circulation of the brain, and consequentlyinfluence also the auditory centers in the cerebrum. 3. The upper five pairs of dorsal spinal nerves influencethe ear by reason of their connection with the
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