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"At the level of the lumbar cistern the nerve roots are suspended in CSF and therefore float away from the pressure of the needle. However, as the nerve roots exiting the vertebral canal at this level approach their fixed dural sleeves laterally, they are unable to move freely. Hence it is necessary to remain in the median plane in order to avoid damage to the nerve roots. The needle must pass through the following body layers in order to reach the lumbar cistern : skin, fat, supraspinous ligament, interspinous ligament, between or through the ligamenta flava, epidural fat and veins, dura, subdural space, and arachnoid." Where is the needle usually inserted to avoid spinal cord damage?It's performed in your lower back, in the lumbar region. During a lumbar puncture, a needle is inserted into the space between two lumbar bones (vertebrae) to remove a sample of cerebrospinal fluid. This is the fluid that surrounds your brain and spinal cord to protect them from injury.
Where would a needle be inserted in order to perform a spinal tap?A lumbar puncture (LP) or spinal tap may be done to diagnose or treat a condition. For this procedure, your healthcare provider inserts a hollow needle into the space surrounding the spinal column (subarachnoid space) in the lower back to withdraw some cerebrospinal fluid (CSF) or inject medicine.
Why is the needle inserted between L3 and L4 for a lumbar puncture?The insertion of a needle under local anaesthetic requires careful positioning to prevent injury to the spinal cord. Since the spinal cord ends as a solid structure around the level of the second lumbar vertebra (L2) the insertion of a needle must be below this point, usually between L3 and L4 (Fig 2).
When performing a lumbar puncture the needle will be placed into which of the following spaces to collect cerebrospinal fluid quizlet?A needle is placed in the subarachnoid space at the level of the 3rd and 4th lumbar vertebra to collect a sample of cerebrospinal fluid.
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When performing a spinal tap Where must the needle be inserted to obtain CSF without damaging the spinal cord quizlet?
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