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)
“‘Cause it does make it so hard when you’re that age and everyone is being mean to you and you have to go to school everyday and deal with people being mean to you and making you feel like what you say is not important and that you’re not important. ” (x)
There was a split second there where his like, “wait, what? bro what are you doing?”
On more serious note, PTSD dogs for veterans are so fucking therapeutic. They’re like the one person you can spill your guts to and never worry about ever being judged or have that secret divulged. There are times when I definitely prefer the company of a dog over a human.
Therapy animals save lives.
These dogs are even still so much more amazing. They check rooms before their handler enters, so they can clear it to help the person feel safe. Like in the gif, they are there when panic attacks or nightmares occur, to be something for the person to help ground themselves on, or yes just to turn on the lights. Even more amazing, many people are able to reduce their medication when they have a PTSD service dog there to help them. These dogs are useful for not just veterans, but also victims of abuse, accident trauma, natural disasters, and others. Their training allows them to be useful in situations where medical assistance is needed, as well. Some PTSD dogs are trained to recognize repetitive behaviours in handlers, and signal the handler to break the repetition and stopping the behaviour and possibly injury.
Service dogs in general are just awesome. Remember to respect any that you see out in public. They are not there for you to walk up to and play with, even the puppies!