Why did the ancient egyptions pull out the brain through the nose?

I think because they thought that Osiris would look at it in the after life.

Answer #2:

1. They pulled it out because it was too wet to mummify properly and might cause decay in the remainder of the body.

2. Through the nose in order to preserve the skull intact

3. Threw it away because, unlike the heart, liver, stomach and intestines (which were saved in Canopic Jars), they did not regard it as a valuable organ.