Arachnoid villi

Arachnoid villi: deep dives inside the brain

Arachnoid villi, also known as arachnoid granulations, are structures found inside the human brain. They are part of the arachnoid membrane, one of the three membranes that surround the brain and spinal cord.

The arachnoid membrane, consisting of two layers, forms a space between itself and the arachnoid membrane called the subarachnoid space. This space contains cerebral fluid, which acts as a shock absorber for the brain and spinal cord and also transports nutrients and removes waste.

Arachnoid villi are projections of the arachnoid membrane into the subarachnoid space. They take the form of many threads or hairs that branch and intertwine with each other, creating a complex three-dimensional structure. Arachnoid villi are usually located on the upper surface of the brain and spinal nerve roots.

The main function of arachnoid villi still remains not fully understood. However, they are believed to play an important role in the circulation of cerebral fluid and maintaining its constant movement. Arachnoid villi create a large contact surface between cerebral fluid and blood vessels, which promotes efficient metabolism and removal of metabolic waste from the brain.

Moreover, arachnoid villi can act as a shock absorber, softening shocks and vibrations that may occur during movement or physical activity. They may also serve a protective function, preventing harmful substances or microorganisms from entering the brain.

Despite the fact that arachnoid villi are found in all people, their size and shape can vary from person to person. Some studies have linked changes in arachnoid villi with various pathologies such as hydrocephalus, migraine and neurological disorders. However, further research is required to fully understand the relationship between arachnoid villous changes and the etiology of these diseases.

In conclusion, the arachnoid villi are an important part of the complex anatomy of the brain and have several functions related to the circulation of cerebral fluid and protecting the brain from external influences. Although their exact functions are not yet fully understood, research continues to uncover their full potential and connections to various diseases. Further research into the arachnoid villous field may shed light on the mechanisms underlying some neurological disorders and lead to the development of new diagnostic and treatment methods.

What it is?

**Arachnoid**e, or **pseudo-iron**e (outdated name) villi - longer and more numerous than arachnoid, processes of the walls of the ventricles of the brain, directed to the pia mater; represent remnants of ependyma. They perform a supporting and connecting function. They are also called granulations, granular fibers. The term "pseudoglands" arose because they have some similarities with glands, but they are not