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Unformatted text preview: 1 PNS Final Exam Study Guide THORACIC SPINAL NERVES: 12 pairs smaller posterior primary division divides into medial & lateral branches supply muscles, ligaments, skin & fascia on dorsal part of body trunk muscles innervated: iliocostalis longissimus spinalis semi spinalis multifidus rotatores spinae splenius colli supra spinales inter spinales ligaments innervated are from the posterior arch of thoracic spine skin & fascia of the dorsal thoracic area larger anterior primary division supply ventral & lateral parts of trunk have independent courses most fibers of T1 join brachial plexus fibers of T12 join the lumbosacral plexus upper 11 pairs go around the rib cage at the lower part of the corresponding rib intercostal nerves subcostal nerves last pair given off below the last pair of ribs intercostals supply: serratus posticus superioris serratus posticus inferioris levatores costarum transversus thoracis (triangularis sterni) intercostalis internus intercostalis externus related blood vessels, bones, articulations, skin & fascia subcostals supply: upper parts of anterior abdominal muscles rectus abdominus transversus abdominus obliquus abdominus internus obliquus abdominus externus may extend as low as skin & fascia of upper buttocks communications: 11 paravertebral ganglia each thoracic spinal nerve gives off white ramus communicans preganglionic fibers ascend to synapse with cervical ganglia preganglionic fibers descend to synapse with lower lumbar or sacral paravertebral ganglia each thoracic spinal nerve receives grey ramus communicans postganglionic sympathetic efferent fibers – vasomotor, sudomotor, pilomotor effects grey ramus is medial to the white ramus LUMBAR SPINAL NERVES: 5 pairs smaller posterior primary division supplies muscles, ligaments, skin & fascia over dorsal lower body trunk muscles innervated: 2 iliocostalis lumborum longissimus dorsi multifidus rotatores spinae larger anterior primary division increase in size as they go from above-down pass under or thru the belly of the psoas major contributes to the formation of the lumbosacral plexus communications: lumbar paravertebral ganglia (usually 4) L1, L2 & sometimes L3 give off white ramus communicans preganglionic fibers descend by interganglionic rami to lower lumbar & sacral paravertebral ganglia to the ganglion impar each lumbar spinal nerve receives a grey rami communicans postganglionic sympathetic efferent fibers...
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This note was uploaded on 04/07/2008 for the course PNS 101 taught by Professor Schmeidster during the Spring '08 term at Palmer Chiropractic.
- Spring '08