QuestionSBA
QuestionChoice
This case is a description of Brown-Sequard syndrome. While very rare, it explains the physiology of the ascending tracts well. The fibres of the spinothalamic tract (pain and temperature sensation) cross over at the level of innervation. Hence, in this case, the fibres from the left lower limb are affected.
10027851
a
Hemiparesis of the right below L2, loss of proprioception and vibration sense on the right lower limb, and loss of pain and temperature sensation on the left lower limb
QuestionChoice
This would be the case for a complete transection of the spinal cord but, in this case, only half of the spinal cord is affected.
10027855
e
Complete loss of all movement and sensation below L2
QuestionChoice
It is the spinothalamic fibres that cross over at the level of innervation so pain and temperature sensation would be lost on the left for this patient.
10027854
d
Hemiparesis of the right below L2, loss of proprioception and vibration sense of the left lower limb, and loss of pain and temperature sensation of the right lower limb
QuestionChoice
This is incorrect because the spinal cord nerves on the right-hand side are innervating the right side of the body, except the spinothalamic fibres. This results in hemiparesis and loss of dorsal column modalities on the right and loss of spinothalamic modalities on the left.
10027853
c
Hemiparesis of the left below L2, and loss of all sensory modalities on the left
QuestionChoice
This would make sense for a hemisection of the right-hand side. However, the spinothalamic fibres cross over at the level of their innervation. So in this case, there will be fibres from the left-hand side involved. This will mean that pain and temperature sensation will be lost on the left but maintained on the right.
10027852
b
Hemiparesis of the right side below L2, and loss of all sensation modalities on the right side
Concept
Chapter
2693
6009
Brown-Sequard syndrome
Topic
152
Neuroscience
17968
A 23-year-old man is involved in a fight outside the pub, and is stabbed in his back. An MRI spine is taken and shows a hemisection of the spinal cord at the L2 level on the right-hand side.

What examination findings would be expected?
a