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Updated: Mar 6, 2026
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Circumscribed Capsular Infarct Modeling Using a Photothrombotic Technique
Published on: June 2, 2016
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Internal capsule: The homunculus distribution in the posterior limb
1Department of Neurology Shengjing Hospital of China Medical University Shenyang China.
Brain and Behavior
|March 16, 2017
Summary
Internal capsule (IC) infarction symptoms can be atypical. This study found hand fibers are lateral to foot fibers, and face fibers are in the premedial posterior limb of the IC, explaining varied patient presentations.
Area of Science:
- Neuroscience
- Neurology
- Neuroanatomy
Background:
- Atypical presentations of internal capsule (IC) infarction symptoms are observed.
- Classical fiber distribution models may not fully explain all clinical manifestations.
Purpose of the Study:
- To investigate the anatomical basis for varied clinical symptoms in patients with internal capsule infarction.
- To correlate lesion location with specific neurological deficits.
Main Methods:
- 34 patients with IC infarction were categorized by symptom severity (hand vs. foot weakness, facial nerve involvement).
- Lesion measurements (length ratio, angle degree) were compared to the posterior limb of the IC (PLIC).
Main Results:
- Significant differences in lesion length ratio were found between groups with predominant hand vs. foot weakness (p=0.027).
- Significant differences in lesion angle degree were observed between groups with and without facial nerve paresis (p=0.038).
Conclusions:
- Hand fibers are situated laterally to foot fibers in the short axis of the PLIC.
- Face fibers are located in the premedial portion of the PLIC.
- These findings clarify the neuroanatomical basis for diverse IC infarction symptoms.
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