Principles and practice of spinal adjustment; for the use of students and practitioners . decided influence upon the nerves, from their mode of development and theirstructure, must be considered as direct prolongations of thebrain substance, rather than as an ordinary cerebrospinalnerve. As the optic nerves pass from the brain they receivesheaths from the three cerebral membranes—a perineuralsheath from the pia mater, an intermediate sheath from thearachnoid, and an outer sheath from the dura mater, whichis also connected with the periosteum as it passes throughthe optic foramen. 2.
Principles and practice of spinal adjustment; for the use of students and practitioners . decided influence upon the nerves, from their mode of development and theirstructure, must be considered as direct prolongations of thebrain substance, rather than as an ordinary cerebrospinalnerve. As the optic nerves pass from the brain they receivesheaths from the three cerebral membranes—a perineuralsheath from the pia mater, an intermediate sheath from thearachnoid, and an outer sheath from the dura mater, whichis also connected with the periosteum as it passes throughthe optic foramen. 2. The suboccipital nerves, by communicating with, andassisting in the formation of the recurrent nerve to the tento-rium, influence the nutrition of the cortical surfaces of theoccipital lobes, and consequently of the optic nerves. 3. The fourth cervical nerves have the most marked influ-ence upon the function of the optic nerves, and also influencethe contraction and dilatation of the pupil. Subluxationsaffecting these nerves have been known to result in loss of 120 SPINAL ADJUSTMENT. Fig. 15. Iarts lufliicncod by the FifthCervical Nerve. CRANIUM, FACE AND NECK 121 vision, and cases are on record where their adjustment hasrestored vision. 4. The first, second and third dorsal nerves have an influ-ence on the action of the ciHary muscles of the eye, by reasonof their communication with the ciliary nerves. Their im-pingement may result in failure of the power of accommo-dation of the eye, and thus cause disturbances of of the eye-lids may be relieved instantly by adjust-ment of the upper thoracic vertebrae. 5. The fifth pair of dorsal spinal nerves influence the eye-balls by reason of their communication with the superiorcervical ganglion, which communicates with the cranialnerves. This connection is established by the communicationof the carotid plexus with the Gasserian ganglion, and withthe sixth nerve; and of the cavernous plexus with the third,the fourth, the
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