Entezami Pouya, Hopper John A
University of Toledo Medical Center, Toledo, OH, USA;
St. Joseph Mercy Medical Center, Ann Arbor, MI, USA.
J Community Hosp Intern Med Perspect. 2015 Apr 1;5(2):26220. doi: 10.3402/jchimp.v5.26220. eCollection 2015.
Since its discovery, our understanding of the primary motor cortex has continued to evolve. The presentations of rare, isolated, motor palsies of small muscle groups have heavily contributed to the characterization of the somatotopic representation of the human body on the cortex. We present a case of localized, left shoulder small muscle group weakness secondary to ischemic cerebral infarction in the primary motor cortex. The patient experienced full recovery over several days. Strokes causing isolated shoulder weakness are rare due to the relatively small area dedicated to shoulder motor function in the precentral gyrus. However, our patient presented with a larger area of infarction than in previously reported cases, demonstrating the large individual variability that may exist within the motor cortex somatotopic map.
自发现以来，我们对初级运动皮层的理解一直在不断发展。罕见的、孤立的小肌肉群运动麻痹的表现对人体在皮层上的躯体定位表征的特征描述有很大贡献。我们报告一例因初级运动皮层缺血性脑梗死继发的局限性左肩小肌肉群无力的病例。患者在数天内完全康复。由于中央前回中专门负责肩部运动功能的区域相对较小，导致孤立性肩部无力的中风很少见。然而，我们的患者梗死面积比先前报道的病例更大，这表明运动皮层躯体定位图可能存在很大的个体差异。
