Which nerve is tested with the withdrawal reflex in the pelvic limbs?
A.The sciatic nerve
B.The peroneal nerve
C.The tibial nerve
D.The femoral nerve
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Aug 13, 2024 12:56 pm
Aug 14, 2024 6:19 pm
In video 4, the sciatic nerve is tested. Check out what each nerve does on the attached slide.
Aug 13, 2024 12:57 pm
And finally, based on videos 1 to 4, where would you localise the lesion?
A.T3-L3
B.T3-S3
C.C6-T2
D.C1-C5
Aug 14, 2024 6:23 pm
So if we assume that the thoracic limb postural reactions were normal and that the videos are showing normal reflexes in the pelvic limbs, then the lesion is T3-L3. You sill see on the attached slide that the 'lower motor neurons' located below L3 are preserved when there is a T3-L3 lesion: these 'lower motor neurons' are directly responsible for the spinal reflexes (L4 to S3) and therefore, if they are intact but the pelvic limbs show proprioception deficits, then the lesion must be T3-L3 (this is an upper motor neuron lesion).
I will show you in the next post how an L4-S3 lesion look like.
Aug 14, 2024 6:29 pm
If the lesion affects the lower motor neurons, then the postural reactions are impaired in the pelvic limbs and the spinal reflexes are reduced. This is a lower motor neuron lesion. It is quite important to understand the difference between lower and upper motor neuron lesion. If you have questions, feel free to ask!
Aug 14, 2024 6:30 pm
Finally, for tonight, how would you describe this panniculus (cutaneus trunci) reflex in the attached video?
A.Normal
B.Reduced / absent up to ~L3 bilaterally
C.Reduced / absent up to ~L3 on the left
D.Reduced / absent up to ~L3 on the right
Aug 15, 2024 8:49 pm
Hello,
The correct response to the cutaneous trunci question was answer 'D: Reduced / absent up to ~L3 on the right.
I have attached a slide that gives you a quick refresher on the panniculus (cutaneus trunci) reflex. Remember that the panniculus reflex does not carry a prognostic value.
Aug 14, 2024 6:31 pm
PS: note that for each question, I have given the answer underneath each post as a 'reply' but I have not created 'new posts' for each; so you need to go back to the question and check the answer - hopefully - just underneath!
