3 Intramedullary spinal cord lesions (important)

Q. Intramedullary spinal cord lesions are characterised by all except

a.Early bladder involvement

b.Dissociated sensory deficits

c.Sacral sparing

d.Root pains

answer: D--root pain...seen in extramedullary
intramedullary lesions like astrocytoma and ependymoma will not disturb the roots,
1.also these interfere with the crossing fibers of lat. spiothalmic tract and so will lead to loss of pain and temperature but the posterior column remains intact---thus Dissociated sensory deficits...
2.early bladder involvement is cuz the bladder contorl fibers are from intermidiate or lateral horn which again is in close proximity to intramedullary lesion
3.sacral sparing is cuz the sacral fibers are placed laterally in spinothalmic tracts...so these are affected by lesions from outside(extramedullary)
:--extramedullary lesions press the cord from outside so they will also disturb roots leading to root pain

MedicoNotebook - Founder : DrShiviMudgal , Co-Founder : DrAyushGoel


  1. damn good explanation , thanku

  2. We are glad to see that our readers are happy and they are gaining from this site. :)


Ask your doubts / point out towards any error / show appreciation / explain anything you wish to.

Related Posts Plugin for WordPress, Blogger...
To Search for a "particular word" on "the page on your screen" , press Ctrl + F and then type the word you need to search on the visible page.

eg: If you need to search the word "Anatomy" on this page -- Press "Ctrl + F" , (a box will appear) and then type Anatomy in the box that has appeared.