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JoVE Encyclopedia of Experiments
Neuroscience
一种立体定向引导消融技术用于大鼠听觉皮层去除
一种立体定向引导消融技术用于大鼠听觉皮层去除
Encyclopedia of Experiments
Neuroscience
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Encyclopedia of Experiments Neuroscience
A Stereotactically Guided Ablation Technique for Auditory Cortex Removal in Rats

一种立体定向引导消融技术用于大鼠听觉皮层去除

Protocol
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05:08 min
July 8, 2025
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Transcript

以一只固定在立体定向框架中的麻醉大鼠为例。

剃

须并消毒头皮,然后切开一个切口,露出头骨。

识别解剖参考 bregma、lambda 和耳间线,以定位听觉皮层,即处理声音信号的大脑区域。

切开并缩回颞肌,露出颞骨。

将

针头放在耳间线的中点。使用这个地标,确定听觉皮层上方的坐标。

钻出

标记区域并去除骨头以暴露大脑。

切开脑膜,覆盖大脑的层。

通过吸出皮质层来进行消融,同时保留白质。听觉皮层切除会破坏声音信号处理能力。

更换切除的骨头,用纱布控制出血,缝合皮肤。

涂抹抗生素软膏预防感染,并给予皮下镇痛药以减轻疼痛。

让大鼠恢复以评估消融的影响。

要开始此过程,请将麻醉的大鼠放在加热垫上以保持其体温。然后使用两个耳杆和一个咬合杆将动物的头部稳定在立体定位框架中。剃掉头皮并用聚维酮碘对手术区域进行消毒。

使用手术刀,沿中线切开一个切口,露出头骨,然后缩回覆盖颅骨表面的骨膜。之后,使用无菌棉尖轻轻去除覆盖颅骨表面的任何血液,以观察前纹、lambda 和耳间线。用手术刀在颞肌背侧插入头骨附近的颞肌上做一个切口。之后,使用针头和缝合材料将肌肉拉出,并将缝合材料固定到立体定向框架上,以露出颞骨。

慢慢降低无菌直针,直到它正好位于颅骨表面上方,使针尖设置在耳间零。将此点设置为零。之后,使用四个点瞄准 AC。然后将针降低到颞骨的正上方,以可视化这四个点中的每一个。在颞骨上用标记标记点并将它们连接起来以绘制一个矩形。矩形将作为在骨骼中打开窗口的指南。

在此过程中,使用电钻和小钻头打开窗户。以 8,000 RPM 的速度钻矩形的周边,直到骨头脱落。用冷无菌盐水冲洗钻孔表面,以冷却钻孔表面,以防止损坏皮质下结构。当骨头塌陷时,注意不要钻入大脑。

当边界松动时,用细镊子拉起覆盖骨并将其存放在冷无菌盐水中。使用手术显微镜,用显微手术刀轻轻切割脑膜,然后使用两把细尖镊子将其取出。如果发生出血,请用冷无菌盐水冲洗手术部位。

接下来,使用与无菌 20 号钝头针头耦合的手术抽吸装置轻轻吸出 AC。只吸出六个皮质层,而不是下面的白质。这一点至关重要,需要非常小心地执行。抽吸完成后,用拔出的骨头覆盖手术部位,并涂上可吸收的止血纱布。

让颞肌恢复原来的位置,然后使用伤口夹缝合皮肤。之后,在伤口上涂抹抗生素软膏。随后,在手术结束后一小时和八小时,在大鼠背部皮下注射丁丙诺啡作为镇痛剂。将动物放在加热垫上直到它醒来,然后将其放回笼子里进行恢复。

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