Precise finger somatotopy revealed by focal motor cortex injury

We report a young man presenting recurrent ischemic strokes with selective finger weakness in whom serial motor cortex mapping procedures were performed.ResultFollowing the first stroke, which largely spared the motor cortex, motor mapping displayed overlap of the motor representations of the hand muscles. The second focal stroke, affecting the lateral part of the hand knob, resulted in selective loss of the first dorsal interosseous muscle motor evoked potentials while sparing those of the adductor digiti minimi muscle. This observation is in apparent contradiction with the first mapping results that suggested complete overlap of motor representations.DiscussionOur mapping results provide evidence for the existence of very precise within-limb somatotopy and confirm the proposed homuncular order, whereby lateral fingers are represented laterally and medial fingers medially. The discrepancy between the initial and subsequent mapping results is discussed in light of functional organization of the primary motor cortex.
Source: Neurophysiologie Clinique - Category: Neuroscience Source Type: research

Related Links:

CONCLUSIONS: MHR may be a significant and independent predictor of poor functional outcome in patients with AIS. PMID: 31941849 [PubMed - as supplied by publisher]
Source: Journal of Atherosclerosis and Thrombosis - Category: Cardiology Tags: J Atheroscler Thromb Source Type: research
AbstractPurposeVisibility of deep medullary veins (DMVs) seen at SWI is predictive of poor prognosis in ischemic stroke. Few attentions have been paid to DMVs in atherosclerotic cerebral small vessel disease (aCSVD) which is attributed to long-term imbalanced microhemodynamics. We conducted this retrospective study to explore the association between DMVs profiles and aCSVD risk factors, neuroimaging markers.MethodsTwo hundred and two patients identified as aCSVD from January 2017 to March 2019 were included in the study. Their demographic, clinical, laboratory, and neuroimaging data were reviewed. The quantity and morpholo...
Source: Neurological Sciences - Category: Neurology Source Type: research
ConclusionFast T2*W sequences demonstrated very good diagnostic performance and inter-reader agreement for detecting SVS in the M1 segment in patients with acute ischemic stroke.
Source: Emergency Radiology - Category: Emergency Medicine Source Type: research
eng Tsong-Hai Lee Ischemic stroke is the most common type of stroke, and early interventional treatment is associated with favorable outcomes. In the guidelines, thrombolytic therapy using recombinant tissue-type plasminogen activator (rt-PA) is recommended for eligible patients with acute ischemic stroke. However, the risk of hemorrhagic complications limits the use of rt-PA, and the risk factors for poor treatment outcomes need to be identified. To identify the risk factors associated with in-hospital poor outcomes in patients treated with rt-PA, we analyzed the electronic medical records of patients who were diagn...
Source: International Journal of Environmental Research and Public Health - Category: Environmental Health Authors: Tags: Article Source Type: research
Publication date: Available online 16 January 2020Source: NeuroscienceAuthor(s): Cao yuze, Zhang huixue, Lu xiaoyu, Wang Jianjian, Zhang xiaoming, Sun shengnan, Bao zhonglei, Tian wenqi, Ning shangwei, Wang lihua, Cui liyingAbstractThe nucleotide oligomerization domain (NOD)-like receptor (NLR) pyrin domain-containing protein 1 (NLRP1) inflammasome has been shown to contribute to brain injury after ischemic stroke. Our previous study showed that microRNA-9a-5p (miR-9a-5p) ameliorates ischemic injury by regulating neuronal autophagy in rats subjected to middle cerebral artery occlusion (MCAO) surgery. The aims of this study...
Source: Neuroscience - Category: Neuroscience Source Type: research
CONCLUSIONS: This pilot study has visualized the effects of stroke lesions on the functional brain networks of individual patients. Consideration of the neurobiologic mechanisms underlying the differences between their connectograms has yielded new hypotheses about differences in the effects of stroke lesions. PMID: 31942767 [PubMed]
Source: Journal of Clinical Neurology - Category: Neurology Tags: J Clin Neurol Source Type: research
CONCLUSIONS: The GGT level was significantly associated with cardioembolic stroke via AF. The results obtained in the present study may explain why GGT is associated with stroke. PMID: 31942759 [PubMed]
Source: Journal of Clinical Neurology - Category: Neurology Tags: J Clin Neurol Source Type: research
This study aimed to determine the association of the plasma FGF23 concentration with intracranial cerebral atherosclerosis (ICAS) and extracranial cerebral atherosclerosis (ECAS). METHODS: We prospectively enrolled 262 first-ever ischemic stroke patients in whom brain magnetic resonance was performed and a blood sample acquired within 24 h after admission. Plasma FGF23 concentrations were measured using an enzyme-linked immunosorbent assay. The presence of ICAS or ECAS was defined as a ≥50% decrease in arterial diameter in magnetic resonance angiography. The burden of cerebral atherosclerosis was calculated by addin...
Source: Journal of Clinical Neurology - Category: Neurology Tags: J Clin Neurol Source Type: research
Purpose of review Diagnosis of stroke and understanding the mechanism of stroke is critical to implement optimal treatment. RNA expressed in peripheral blood cells is emerging as a precision biomarker to aid in stroke diagnosis and prediction of stroke cause. In this review, we summarize available data regarding the role of RNA to predict stroke, the rationale for these changes, and a discussion of novel mechanistic insight and clinical applications. Recent findings Differences in RNA gene expression in blood have been identified in patients with stroke, including differences to distinguish ischemic from hemorrhagic s...
Source: Current Opinion in Neurology - Category: Neurology Tags: CEREBROVASCULAR DISEASE: Edited by Mitchell S.V. Elkind Source Type: research
Purpose of review Focal cerebral arteriopathy (FCA) is one of the most common causes of arterial ischaemic stroke in a previously healthy child. Distinguishing between different subtypes of arteriopathy is challenging and has significant management implications. Recent findings Recent studies have helped to define the subtypes of focal cerebral arteriopathies and improved understanding of their clinical and radiological features. In addition, they have reported new evidence for the association between viral infection and inflammation in the pathogenesis of FCA and proposed new radiological, serum and cerebrospinal flu...
Source: Current Opinion in Neurology - Category: Neurology Tags: CEREBROVASCULAR DISEASE: Edited by Mitchell S.V. Elkind Source Type: research
More News: Brain | Ischemic Stroke | Neurology | Neuroscience | Stroke