#22 - Although severing a motor nerve kills part of the

[Luke Haqq]

Hi RickyLW!

Your reasoning makes sense. The stimulus only mentions that the sheath "begins to disintegrate after three months," meaning that it's present within three months and still present for some amount of time after that.

[lsatstudent99966]

Hi there,

Is (C) also wrong because the last sentence of the stimulus says "unless there is living nerve tissue within it"?

So according to the stimulus, if there is living nerve tissue inside the nerve sheath, then the nerve sheath wouldn't even start disintegrating after 3 months, so (C) must be wrong because it didn't even rule out the possibility that there is living nerve tissue inside the nerve sheath?

(I understand that even if there is no living nerve tissue inside the sheath, so the sheath starts to disintegrate after 3 months, we still can't say for sure that muscle function can't be restored. I just hope to confirm if this other understanding of why (C) is wrong is also correct?)

Thank you very much!

[Adam Tyson]

if there is living nerve tissue inside the nerve sheath, then the nerve sheath wouldn't even start disintegrating after 3 months

This is actually a mistaken reversal of the relationship in the stimulus, 99966. The contrapositive should actually be:

If there is no living tissue inside the nerve sheath, then the nerve sheath will start disintegrating after about 3 months.

You're correct that answer C is wrong in part because of that "unless" statement. It fails to account for the possibility that the nerve sheath might last a lot longer as long as there is living tissue inside.

[lsatstudent99966]

if there is living nerve tissue inside the nerve sheath, then the nerve sheath wouldn't even start disintegrating after 3 months

This is actually a mistaken reversal of the relationship in the stimulus, 99966. The contrapositive should actually be:

If there is no living tissue inside the nerve sheath, then the nerve sheath will start disintegrating after about 3 months.

You're correct that answer C is wrong in part because of that "unless" statement. It fails to account for the possibility that the nerve sheath might last a lot longer as long as there is living tissue inside.

Thank you so much for pointing out the reversal flaw in my original statement Adam!