The anatomist's vade mecum : a system of human anatomy . ch escapes thi^ough the intervertebralforamen, and divides into an anterior branch for the supply of thefront aspect of the body, and a posterior branch for the posterioraspect. In the first cervical and last sacral and coccygeal nerve thisdivision takes place within the dura mater and in the upper four sacralnerves externally to that cavity, but within the sacral canal. Theanterior branches, with the exception of the first two cervical nerves,are larger than the posterior ; an arrangement which is proportionedto the larger extent of sur
The anatomist's vade mecum : a system of human anatomy . ch escapes thi^ough the intervertebralforamen, and divides into an anterior branch for the supply of thefront aspect of the body, and a posterior branch for the posterioraspect. In the first cervical and last sacral and coccygeal nerve thisdivision takes place within the dura mater and in the upper four sacralnerves externally to that cavity, but within the sacral canal. Theanterior branches, with the exception of the first two cervical nerves,are larger than the posterior ; an arrangement which is proportionedto the larger extent of surface they are required to supply. The Spinal nerves are divided into— Cervical 8 pairs Dorsal 12 Lumbar 5 Sacral 5 Coccygeal 1 The cervical nerves pass off transversely from the spinal cord; thedorsal are oblique in their direction; and the lumbar and sacral, 458 CERVICAL NERVES. vertical; the latter form the large assemblage of nerves, at the ter-mination of the cord, called cauda equina. The cauda equinaoccupies the lower third of the spinal CERVICAL NERVES. The cervical nerves increase in size from above downwards; thefirst (sub-occipital) passes out of the spinal canal between the occi-pital bone and the atlas, the second between the posterior ring of theatlas and the lamina of the axis; and the last between the lastcervical and first dorsal vertebra. Each nerve, at its escape from theintervertebral foramen, divides into an anterior and a posterior anterior branches of the four upper cervical nerves form thecervical plexus; the posterior branches, ^q posterior cervical anterior branches of the fom* inferior cervical together with thefirst dorsal form the brachial plexus. Anterior cervical nerves.—The anterior branch of the firstcervical nerve escapes from the vertebral canal through the groove. * Part of the cervical portion of the spinal cord, viewed on its posterioraspect; and showing its membranes and the posterior roots of the spinalner
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
