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+--- Thread: NBME 17- CNS --- doesn't make sense - bestrong16 (/showthread.php?tid=820425)
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NBME 17- CNS --- doesn't make sense - bestrong16 - ArchivalUser - 01-15-2016
69 yo woman comes to the physician because she has had weakness of her left leg since awakening that morning. Physical exam shows weakness of the extremity. A Babinski sign is present on the left. SEnseory testing shows decreased somatic sensation in the left foot, agraphesthesia on the plantar surfaces of the toes and decreased position sense in the toes. An MRI of the brain shows an edematous are in the cerebral cortex of the right hemisphere. The most likely cause of this condition is a lesion located at which of the following labeled areas in the photographs of normal brains shown?
Does anyone know why not H? I chose H but answer is G? I thought
G was somatoMotor
H was somatoSensory
so since she has somatic sensation decreased it would be H area, why is the answer G?
0 - ArchivalUser - 02-28-2016
i have the same question. people are saying its G. but why? did you find the answer? thank you.
0 - ArchivalUser - 02-28-2016
its G. in the hemisection, thats not the central sulcus. thats why it G.
0 - ArchivalUser - 02-28-2016
i thought a is the answer...i don know..
0 - ArchivalUser - 02-28-2016
anyone who got this correct plz answer http://imgur.com/RQGrWLw
0 - ArchivalUser - 02-28-2016
The 1ry MOTOR cortex/M1 its territory of PREcental gyru/motor cortex & front/anterior on paracentral lobule ( on medial brain surface as Q signs restricted to other side/ contralateral lower limb/Babinski extensor plantar pinted pic in stem of Q ) Postcentral gyrus( somatosensory cortex) lick to paracentral 1st somatic sensory bz high density & create localized sensation on electrical tickle. “Paracentral lobule” in part SENSORY & MOTOR critical area.
=> G correct ans.
0 - ArchivalUser - 02-29-2016
Hi guys I need the answers of NBME 17 ,16 and 15.Can you send to my email sesy12313! Thank you!
0 - ArchivalUser - 03-01-2016
central sulcus in the picture is not the one after G, i think, if G is the answer, only then can G make sense as an answer...
0 - ArchivalUser - 11-10-2017
The question states that the pt is complaining of problems in the legs (probably from affection to ACA) presenting ↓somatic sensation of the L+ Foot w/ findings specific for the Toes. If you look the Homunculus the letter G is representing the Ankle and Toe area. Making these a better choice than letter A (which also represents somatosensory area) but of hands or face (irrigated by MCA). Letter H can't be a correct choice because that area is irrigated by PCA.
0 - ArchivalUser - 03-23-2018
See broadman areas and you will learn the answer is clearly G
G corresponds to broadman areas 1, 2, and 3. Area H (Broadman 7) is also parietal, but is not linked through the Thalamus... it is more of an association area, beginning o mix with proprioception and vision.
https://www.usmleforum.com/images/kJYhzq
All explained here and you will see symptoms from the question are pathognomonic for damage to this area.
https://en.wikipedia.org/wiki/Primary_somatosensory_cortex