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Myelography
Question | Answer |
---|---|
How far down does the spinal cord extend? | L1 - L2 |
What is the conus medullaris? | pointed end of the spinal cord |
How many pairs of spinal nerves are there? | 31 |
From which part of the spinal cord do nerves come from? | each side |
- three continuous, protective membranes that enclose the brain and spinal cord | meninges |
- inner sheath; highly vascular and closely adhered | pia mater |
- delicate central sheath | arachnoid |
- wide space between arachnoid and pia mater | subarachnoid space |
- general term applied to the radiologic examination of the CNS structures situated in the vertebral canal | myelography |
What are the most common puncture sites for myelography? | l3-L4 and sometimes L2-L3 |
Why does the image intensifier need to be locked? | to prevent accidental contact with sterile field or spinal needle |
What is the most common scout image? | cross table lateral L-spine prone |
Along with the prone position, what is another position that can be used for the procedure? | lateral with spine flexed |
How much contrast is generally used? | 9 - 12 mL |
Why is the table angled trendelenburg? | visualization of the cervical region |
Why is the table angled Fowler's? | to see the thoracic and lumbar regions |
If contrast is in the cervical region, how is the head positioned and why? | in actue extension to prevent contrast from entering ventricular system |
What is the only position that will prevent contrast from entering ventricles? | acute extension |
What is used to demonstrate encroachment on and compression of the spinal cord as a result of disk herniation, tumor growth, degenerative diseases or posttraumatic swlling of the cord? | myelography |
What type of herniation is NOT demonstrated in myelography? | anterior protrusion of a herniated disk |
What is diskography? What is demonstrated? | injecting contrast medium into the individual disks; internal disk lesions |