论文部分内容阅读
过去在讲“鲫鱼的骨胳和神经系统”一节课中,同学们对鱼骨胳的组成和机能以及对水中生活的适应都能够理解,而且也容易讲.但在讲椎体上下的髓弓和脉弓时,感到讲解吃力,同时时间也化的较长.同学们对鱼的神经系统虽了解其分化和机能,但因缺乏演示而感到无味.本学期在教这节课中利用了一条活鲫鱼,结合课文演示了三次,改进了以往教学,提高了教学效果. 我在讲这节课前,准备了一个大玻璃缸,内放一条活鲫鱼.在讲前半节骨胳时,结合了板画与鲫鱼骨胳标本进行讲解.在讲解神经系统时便结合了演示.为了证实脑和脊髓的作用,即把活鲫鱼从水中取出(取出的当时,把鱼在水中难于捉到和捉到后鱼挣扎的情况,有意识的让同学们看到).取出后立即用解剖针在头和躯干相联之处(图1)的正背面轻轻刺入(刺入深度不到1厘米),刺后立即把鱼放入水中.
In the past, when talking about “the skeleton and nervous system of crucian carp,” students were able to understand the composition and function of fish bones and adapt to the life in the water, and it is also easy to talk about. However, Bow and bow bow, I feel difficult to explain, but also time is also longer. Although students understand the fish’s nervous system differentiation and function, but because of the lack of presentation and feel boring. This semester in teaching this class to use A live crucian carp, combined with text demonstrating three times, improved teaching in the past, improve the teaching effect.I before this lesson, I prepared a large glass tank, put a live crucian carp in the first half of the bone when the combination of In order to confirm the role of the brain and spinal cord, the living carp was removed from the water (at that time, it was difficult to catch and catch the fish in the water After the fish struggled, consciously let the students see.) Remove immediately after using the dissection needle in the head and trunk connected to the front and back of the lightly pierced (piercing depth less than 1 cm) After the thorn the fish into the water immediately.