「Nerve05/disorders of the spinal cord and optic pathway/basics of optic pathway」の版間の差分

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[[ファイル:00725.jpg|500px]]  
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１．When an image goes through the lens (of an eye, just as with the lens in the camera), the image is projected to the other side of the center.  So, the images on the outer side of the visual field for either eye (the cylinders), is projected to the inner half of the retina, and the image on the inner side of the visual field for either eye (the standing box) is projected to the outer half of the retina.   
１．When an image goes through the lens (of an eye, just as with the lens in the camera), the image is projected to the other side of the center of the lens.  So, the images on the outer side of the visual field for either eye (the cylinders), is projected to the inner half of the retina, and the image on the inner side of the visual field for either eye (the standing box) is projected to the outer half of the retina.   


２．視神経は上図のように視交叉で半分の線維が交叉している．交叉する線維は網膜の鼻側半分にあった神経節細胞からの線維である．網膜の耳側半分からの線維は交叉せずに同側の大脳皮質へいたる．
２．Half of the fibers in the optic nerve cross the right-left midline at the optic chiasma as shown in the figure.  The fibers from the inner half of the retina cross to the other side.  The fibers from the outer half of the retina do no cross the midline and reach the cerebral cortex on the same side.
 
上記は原則であると同時にまとめである．次の４つのステップで具体例を見てみよう．


The above is the basics and summary at the same time.  Let's separate the visual fields into 4 in the following 4 steps.
{{QuizTitle}}
{{QuizTitle}}
<GIFT>
<GIFT>
//LEVEL:2
//LEVEL:2
//RAND
//RAND
水晶体のはたらきにより,眼球の中心より耳(外)側の視野は,網膜の　 {~耳(外).=鼻(内)} 側半分に写る.
Because of the lens, the image in the outer side of the center of an eye, is projected to the {~outer.=inner} half of the retina.


//LEVEL:3
//LEVEL:3
//RAND
//RAND
水晶体のはたらきにより,眼球の中心より鼻(内)側の視野は,網膜の　 {=耳(外).~鼻(内)} 側半分に写る.
Because of the lens, the image in the inner side of the center of an eye, is projected to the {=outer.~inner} half of the retina.


//LEVEL:3
//LEVEL:3
//RAND
//RAND
右視神経線維の大部分は視交叉で左へ交叉する.　 {~正.=誤}  
Most fibers in the right optic nerve cross to the left at the optic chiasma. {~true.=false}


//LEVEL:3
//LEVEL:3
//RAND
//RAND
左視神経線維の大部分は視交叉で右へ交叉する.　 {~正.=誤}  
Most fibers in the left optic nerve cross to the right at the optic chiasma. {~true.=false}


//LEVEL:2
//LEVEL:2
//RAND
//RAND
網膜の鼻(内)側半分からの神経線維は視交叉で対側へ交叉　 {=する.~しない} .
In the optic nerve, fibers from the inner half of the retina {=do.~do not} cross the right-left midline.


//LEVEL:3
//LEVEL:3
//RAND
//RAND
網膜の耳(外)側半分からの神経線維は視交叉で対側へ交叉　 {~する.=しない} .
In the optic nerve, fibers from the outer half of the retina {~do.=do not} cross the right-left midline.
 
</GIFT>
</GIFT>

2012年9月23日 (日) 00:13時点における版

00725.jpg

１．When an image goes through the lens (of an eye, just as with the lens in the camera), the image is projected to the other side of the center of the lens. So, the images on the outer side of the visual field for either eye (the cylinders), is projected to the inner half of the retina, and the image on the inner side of the visual field for either eye (the standing box) is projected to the outer half of the retina.

２．Half of the fibers in the optic nerve cross the right-left midline at the optic chiasma as shown in the figure. The fibers from the inner half of the retina cross to the other side. The fibers from the outer half of the retina do no cross the midline and reach the cerebral cortex on the same side.

The above is the basics and summary at the same time. Let's separate the visual fields into 4 in the following 4 steps.

Challenge Quiz

1.

Because of the lens, the image in the outer side of the center of an eye, is projected to the outer.inner half of the retina.

2.

Because of the lens, the image in the inner side of the center of an eye, is projected to the outer. inner half of the retina.

3.

Most fibers in the right optic nerve cross to the left at the optic chiasma. true.false

4.

Most fibers in the left optic nerve cross to the right at the optic chiasma. true.false

5.

In the optic nerve, fibers from the inner half of the retina do. do not cross the right-left midline.

6.

In the optic nerve, fibers from the outer half of the retina do.do not cross the right-left midline.

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