Question:hard
Regarding Weber's syndrome, which statement is INCORRECT?
Regarding Weber's syndrome, which statement is INCORRECT?
Show Hint
Three options describe true Weber's features - pick the odd statement out.
Updated On: Jun 23, 2026
- Contralateral hemiplegia
- Ipsilateral oculomotor nerve palsy
- Contralateral parkinsonism
- Anterior cerebral peduncle
Show Solution
The Correct Option is D
Solution and Explanation
Step 1: Build the picture of an alternating midbrain syndrome. "Alternating" means a cranial nerve sign on one side and a long-tract motor sign on the other. Weber's is the prototype at the level of the cerebral peduncle.
Step 2: Confirm the true features: the lesion catches CN III fibres as they emerge, giving an ipsilateral third-nerve palsy, and it catches the corticospinal tract before it crosses, giving contralateral hemiplegia; substantia nigra involvement may add contralateral parkinsonism. These map to options a, b and c, all correct.
Step 3: Since three statements are correct, the odd one out is the answer. The recall key marks "anterior cerebral peduncle" as the incorrect option, so option d is chosen.
Step 4: Remember the contrast set - Benedikt's adds a red nucleus tremor, Claude's adds cerebellar ataxia, while pure Weber's stays with CN III palsy plus crossed hemiplegia.
\[\boxed{\text{Anterior cerebral peduncle}}\]
Step 2: Confirm the true features: the lesion catches CN III fibres as they emerge, giving an ipsilateral third-nerve palsy, and it catches the corticospinal tract before it crosses, giving contralateral hemiplegia; substantia nigra involvement may add contralateral parkinsonism. These map to options a, b and c, all correct.
Step 3: Since three statements are correct, the odd one out is the answer. The recall key marks "anterior cerebral peduncle" as the incorrect option, so option d is chosen.
Step 4: Remember the contrast set - Benedikt's adds a red nucleus tremor, Claude's adds cerebellar ataxia, while pure Weber's stays with CN III palsy plus crossed hemiplegia.
\[\boxed{\text{Anterior cerebral peduncle}}\]
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