. Cunningham's Text-book of anatomy. Anatomy. 688 THE NERVOUS SYSTEM. and laterally among the muscles, and become superficial at a greater distance from the median plane. In both regions the nerves pursue a sinuous course to the surface, and the lower series emerge and become superficial a considerable distance below the level of their spinal origin. There are considerable individual differ- ences in the origin, course, and distribu- tion of the several nerves. CERVICAL NERVES. First Cervical Nerve (N. sub-occip- italis).—It has already been pointed out that the posterior root of this nerve ma
. Cunningham's Text-book of anatomy. Anatomy. 688 THE NERVOUS SYSTEM. and laterally among the muscles, and become superficial at a greater distance from the median plane. In both regions the nerves pursue a sinuous course to the surface, and the lower series emerge and become superficial a considerable distance below the level of their spinal origin. There are considerable individual differ- ences in the origin, course, and distribu- tion of the several nerves. CERVICAL NERVES. First Cervical Nerve (N. sub-occip- italis).—It has already been pointed out that the posterior root of this nerve may berudimentary, or even absent altogether. Its posterior ramus is larger than the anterior ramus; it does not divide into medial or lat- eral branches, and it does not directly supply any cutaneous branch. Passing backwards, in the space be- tween the oc- cipital bone and the posterior arch of the atlas, the nerve occu- pies the sub-oc- cipital triangle, and is placed below and be- hind the ver- tebral artery, and undercover of the semi- spinalis capitis muscle. It sup- plies the follow- ing branches:— (a) Muscular branches to the semispinalis Fig. 607.—The Distribution op Cutaneous Nerves on the Back of the Trunk. On one side the distribution of the several nerves is represented, the letters indicating their nomenclature. G'° ^iS6r °°Vf \ Pu3, T,Wrd °Cdpital; T'1 et seV-> Posterior rami of ^cic nerves ; et seq., ™T T of. first *h™e lumba? nerves ; et seq., Posterior rami of sacral nerves ; Acr, Posterior fKSlT v f eS-11fr°m Ce,'ViCal plexUS; T-2"12' Lateral branches of thoracic nerves ; Circ, °rv«% p teS-°f aX1"ary nerVe ; LJ'Iliac branch of ^"hypogastric nerve ; , Lateral cutaneous nerve , , Posterior cutaneous nerve of thi<*h On the other side a schematic representation is given of the areas supplied by the above nerves, the numerals indicating the spinal origin of the branches of distribution to each Please note
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