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23 Cards in this Set
- Front
- Back
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spinal nerves |
31 pairs 8 c1-8 12 t1-12 5 l1-5 5 s1-5 1 c0 |
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spinal cord segment |
portion of spinal cord that give rise to 1 bilateral pair of spinal nerves |
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structure of spinal nerve |
anterior rootlet and root=motor posterior rootlet and root=sensory posterior (dorsal) root ganglion=house sensory neuron cell bodies anterior ramus=mixed (thicker than posterior ramus) posterior ramus=mixed |
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structures assc with sympathetic nervous system |
gray ramus communicans white ramus communicans sympathetic (paravertebral) ganglion |
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recurrent meningeal nerves branched out from spinal nerve |
reenter intervertebral foramen to supply dura,ligaments,intervertebral discs, and blood vessels |
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cutaneous innnervation |
skin areas innervated by particular peripheral nerves (may be composed of sensory fibers from more than 1 spinal segment) |
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dermatomes |
bandlike areas of skin innervated by sensory fibers from a single spinal nerve from single segment of spinal cord |
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pattern of loss of cutaneous sensation help diagnose |
nerve lesion |
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spinal nerve c1 |
purely motor so no c1 dermatome |
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dorsal rami of L4 and 5 |
not have cutaneous branches so not be represented as dermatomes on back |
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c5 c567 c8t1 c6 c678 t10 s1 s234 |
clavicle lateral parts of upper limbs medical parts of upper limbs thumb hand level of umbilicus lateral margin of foot and little toe perineum |
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herpes zoster |
virus that produces chickenpox virus remain dormant in cells of spinal ganglia when virus activated, travel along dermatome associated nerve painful rash appears |
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lumbar anesthesia |
done similar to lumbar puncture |
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epidural anesthesia |
administered by place a catheter in epidural space without penetrating dural sac. also done by passing needle thru sacral hiatus |
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order of needle |
skin superficial fascia supraspinous ligament interspinous ligament ligament flava |
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lesions in spinal cords regions transection of spinal cord result in |
loss of all sensation and voluntary movement inferior to lesion |
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c1-3 |
no function below head, ventilator required to maintain respiration |
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c4-5 |
quadriplegia(no function of upper and lower limbs), respiration occur |
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C6-8 |
loss of lower limb function + loss of hand and upper limb function. person can self-feed or propel wheelchair |
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t1-9 |
paraplegia(paralysis of both lower limbs). amount of trunk control varies with height of lesion |
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t10-l1 |
thigh muscle function. walk with long leg braces |
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l2-3 |
use most leg muscle function walk with short leg braces |
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laminectomy |
remove one or more spinous processes and adjacent laminae to gain access to vertebral contents. relieve pressure on spinal cord or nerve roots caused by tumor, herniated intervertebral disc, bony hypertrophy |
