Names Danny B. I love all things scientific and historic. Friends and family mean everything to me. I have Aspergers, only adding to my personality, not detracting. I'm single, in my 20's and live in the West MIdlands, England...soooo yeeaah that's me!
If, in some cataclysm, all of scientific knowledge were to be destroyed, and only one sentence passed on to the next generations of creatures, what statement would contain the most information in the fewest words? I believe it is the atomic hypothesis…that all things are made of atoms—little particles that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another.
By ￼￼￼￼￼Richard Feynman, Lectures on Physics, Volume 1 (via scientificpunkrock)
As you can see, the arachnoid membrane contains a lot of venes laying on top of brain’s surface (cortex) in order to guarantee a good blood circulation in the brain region. Also, it plays a large role for the cerebrospinal fluid.
Cerebrospinal fluid circulates in the subarachnoid space (between arachnoid and pia mater). It is produced by the choroid plexus (inside the ventricles of the brain, which are in direct communication with the subarachnoid space so the fluid can flow freely through the nervous system).
Cerebrospinal fluid is a transparent, colourless fluid and it is produced at about 500 ml/day. Its electrolyte levels, glucose levels, and pH are very similar to those in plasma, but the presence of blood in cerebrospinal fluid is always abnormal.
The arachnoid mater is named after the Greek words “Arachne” (“spider”) and suffix “-oid” (“in the image of”), and “mater” (the Latin word for mother), because of the fine spider web-like appearance of the delicate fibres of the arachnoid which extend down through the subarachnoid space and attach to the pia mater.
Image found on mr-friendly-awesomesauce.tumblr.com (if you go to this page, there are NSFW photos)