|
| ||
|
|
||
Brain Surface (brain + surface)
Selected AbstractsSystematization, Distribution and Territory of the Middle Cerebral Artery on the Brain Surface in Chinchilla (Chinchilla lanigera)ANATOMIA, HISTOLOGIA, EMBRYOLOGIA, Issue 1 2009A. C. P. De Araujo Summary The aim of the present study was to analyse thirty chinchilla (Chinchilla lanigera) brains, injected with latex, and to systematize and describe the distribution and the vascularization territories of the middle cerebral artery. This long vessel, after it has originated from the terminal branch of the basilar artery, formed the following collateral branches: rostral, caudal and striated (perforating) central branches. After crossing the lateral rhinal sulcus, the middle cerebral artery emitted a sequence of rostral and caudal convex hemispheric cortical collateral branches on the convex surface of the cerebral hemisphere to the frontal, parietal, temporal and occipital lobes. Among the rostral convex hemispheric branches, a trunk was observed, which reached the frontal and parietal lobes and, in a few cases, the occipital lobe. The vascular territory of the chinchilla's middle cerebral artery included, in the cerebral hemisphere basis, the lateral cerebral fossa, the caudal third of the olfactory trigone, the rostral two-thirds of the piriform lobe, the lateral olfactory tract, and most of the convex surface of the cerebral hemisphere, except for a strip between the cerebral longitudinal fissure and the vallecula, which extended from the rostral to the caudal poles bordering the cerebral transverse fissure. [source] MRI monitoring of heating produced by ultrasound absorption in the skull: In vivo study in pigsMAGNETIC RESONANCE IN MEDICINE, Issue 5 2004Nathan McDannold The purpose of this study was to test the utility of MR thermometry for monitoring the temperature rise on the brain surface and in the scalp induced by skull heating during ultrasound exposures. Eleven locations in three pigs were targeted with unfocused ultrasound exposures (frequency = 690 kHz; acoustic power = 8.2,16.5 W; duration = 20 s). MR thermometry (a chemical shift technique) showed an average temperature rise in vivo of 2.8°C ± 0.6°C and 4.4°C ± 1.4°C on the brain surface and scalp, respectively, at an acoustic power level of 10 W. The temperature rise on the scalp agreed with that measured with a thermocouple probe inserted adjacent to the skull (average temperature rise = 4.6°C ± 1.0°C). Characterization of the transducer showed that the average acoustic intensity was 1.3 W/cm2 at an acoustic power of 10 W. The ability to monitor the temperature rise next to the skull with MRI-based thermometry, as shown here, will allow for safety monitoring during clinical trials of transcranial focused ultrasound. Magn Reson Med 51:1061,1065, 2004. © 2004 Wiley-Liss, Inc. [source] Neuroanatomy and Volumes of Brain Structures of a Live California Sea Lion (Zalophus californianus) From Magnetic Resonance ImagesTHE ANATOMICAL RECORD : ADVANCES IN INTEGRATIVE ANATOMY AND EVOLUTIONARY BIOLOGY, Issue 10 2009Eric W. Montie Lateral view of MRI reconstruction of the brain surface of a California sea lion. The reconstruction placed in a parasagittal section through surrounding head structures. See Montie et al., on page 1523, in this issue. [source] Spike-monitoring of anaesthesia for corpus callosotomy using bilateral bispectral indexANAESTHESIA, Issue 7 2009S. Ogawa Summary During corpus callosotomy for intractable epilepsy, the electrocorticogram is commonly recorded from electrodes placed on the brain surface to monitor of epileptic activity and assess the synchronisation of epileptic signals between the left and the right hemispheres. We evaluated the usefulness of bilateral bispectral index monitoring using two monitors and two sensors placed above the frontal region. Spikes were readily detected on the electroencephalogram on the bispectral index monitor, and the frequency of their occurrence increased or decreased in response to adjustment of the sevoflurane concentration. The disappearance of synchronisation between the left and the right hemispheres was observed with use of the bispectral index , in concordance with the electrocorticogram. Thus, ,spike-monitoring anaesthesia' using bilateral bispectral index was useful in assessing both the effect of anaesthetics on the electroencephalogram signals and the surgical therapeutic effect. [source] | |||||||||||||