Masaki Komiyama

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Variations of the extensor indicis muscle were examined in 164 hands from 86 Japanese cadavers. Anomalous cases exhibiting supernumerary muscles or tendons were found in 22 hands. These variations were classified into four types: type 1, an additional tendon slip from the extensor indicis tendon; type 2, an extensor indicis radialis or extensor pollicis et(More)
Among the cases of ruptured aneurysms we have handled, some patients have rebled before surgery was performed. In this study, we examine the factors that contribute to the rerupture of cerebral aneurysms in the acute stage and suggest measures to prevent rerupture prior to surgery. We have encountered 32 cases of rebleeding prior to surgery. The rebleeding(More)
OBJECTIVE AND IMPORTANCE The occurrence of spontaneous spinal subarachnoid hematoma of unknown pathogenesis is extremely rare. In the cases reported to date, the hematoma, located dorsal to the spinal cord (dorsal type), has caused paraplegia and has required emergency surgical intervention. CLINICAL PRESENTATION We examined two patients who sustained(More)
PURPOSE Our goal was to analyze the anatomic similarity between the duplicated middle cerebral artery (MCA) and the accessory MCA and their relationship to the early branches of the MCA. METHODS We reviewed stereoscopic angiograms of duplicated MCAs in four patients and accessory MCAs in four patients with reference to the origin, size, and cortical(More)
The balloon occlusion test (BOT) of the internal carotid artery (ICA), combined with induced hypotension and cerebral blood flow (CBF) mapping, was carried out in three patients with a large or giant aneurysm of the ICA. Occlusion of the ICA for 10 minutes in the normotensive state was followed by 5 minutes of induced hypotension. During the last 2 minutes(More)
The incidences of arterial dissection of the vertebral artery (VA) of aortic origin and VA of subclavian artery origin were determined. The origins of the left and right VAs were confirmed by angiography in 860 and 717 patients, respectively. Left VA of aortic origin was found in 21 patients (6 females and 15 males) but no right VA of aortic origin was(More)
Rhodamine (Rho)-labeled muscle and non-muscle actins were microinjected into cultured embryonic chicken cardiac myocytes and fibroblasts. After incorporation of the fluorescent actin analog into cellular structures, small areas of labeled structures were photobleached with a laser pulse, and fluorescence recovery (FR) was measured to determine the(More)
Oligopeptides are efficiently hydrolyzed by Ce(IV) to the corresponding amino acids under mild conditions. The pseudo first-order rate constants for the hydrolysis of H-Gly-Phe-OH and H-Gly-Gly-OH at pH 7.0 and 50 degrees C are 3.5 x 10(-1) and 2.8 x 10(-1) h(-1), with [Ce(NH4)2(NO3)6]0=10mM (the half-lives are 2.0 and 2.5 h). The catalytic activity of the(More)
OBJECTIVE AND IMPORTANCE Few reports have been published on ruptured vertebral artery dissecting aneurysms in which the posteroinferior cerebellar artery (PICA) arises from the aneurysm wall, and there is ongoing debate as to the proper management of this type of aneurysm. This article describes two patients. CLINICAL PRESENTATION Both patients presented(More)