Question:

Which one of the following options is true in relation to the spinal dura:
1. It has loose folds during neck extension.
2. Normally it is shorter than the bony canal.
3. It attaches to all the walls of the bony spinal canal.
4. It is surrounded by CSF.
5. It has loose folds during neck flexion.





Answer:

The correct answer for the question "Which one of the following options is true in relation to the spinal dura:" is:

1. It has loose folds during neck extension.



Explanation
A. Spinal dura [size is greater in the cervical and lumbar regions allowing it to have some loose folds during neck extension and during flexion it stretches due to the increased length of the spinal cervical canal.]

B.  [Normally, the dural sheath is larger than what is needed for its contents.]

C. [Normally, the spinal dura is a loose sheath around the cord attached to the foramen magnum, C2-C3, and posteriorly to the longitudinal ligament by fibrous bands.]

D. CSF is within the spinal dural sac. [The dural sac is separated from the bony vertebral canal by the epidural space which contains a plexus of veins and loose areolar tissue.]

E. The spinal dura stretches during flexion [during flexion it stretches due to the increased length of the spinal cervical canal.]



From the manuscript:
Magnetic resonance imaging in Hirayama Disease
Radiology Case. 2011 Mar; 5(3):17-23


This article belongs to the Neuro section.




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From the manuscript

Magnetic resonance imaging in Hirayama Disease

Free full text article: Magnetic resonance imaging in Hirayama Disease

Abstract
Hirayama disease (HD) is a rare type of cervical myelopathy related to flexion of the neck characterized by progressive muscular weakness and atrophy of the distal upper limbs most frequently seen in young males. HD is thought to be secondary to an abnormal anterior displacement of the posterior dura with secondary compression of the lower cervical spinal cord and chronic injury to the anterior gray matter horns. We present two patients with HD and discuss its pathophysiology and imaging characteristics.






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