08/20/2020
Just breathe.
Perhaps the most important fluid of your body is the 250ml of cerebrospinal fluid that flows around a system of pipes surrounding the brain called the ventricles.
CSF is produced by the choroid plexus in the third ventricle, and from here it circulates through the brain via the ventricles and then to the spinal cord.
Each day the entire volume of CSF is replaced four times. During sleep, the blood brain barrier relaxes to let CSF into the neurons and flush out the build-up from the day.
The veins around the chest vertebrae column transmit pressure upwards to the brain. They make up a sprawling network of tinier veins that extend up into the epidural venous system of the spinal canal. It’s called a venous plexus.
During an inhale and exhale the chest rises and falls. The change in pressure flows upward to the CSF dynamics around the brain.
Here’s how it works:
Breath in (inspiration) – Lowers chest pressure and empties the venous plexus. CSF flows down the spine.
Breath out (expiration) – Increases chest pressure and fills the venous plexus, pushing CSF up the spine into the head.
The choroid plexus has many different functions. It eliminates waste products from brain tissues. It controls the travel of immune T cells in the CSF that promote cognition and fight infections in the brain.
It regulates the travel of critical microglia and neural stem cells that create new brain cells of all types. It is the major determinant of critical neuroplasticity time windows during brain development.
It is vital for the health of the brain regulating the immune surveillance and the maintenance and pruning of synapses.
CSF fluid is secreted by the choroid cells into the lateral ventricles; it flows to the third and fourth ventricles and then to the spinal cord. It is taken up in the sub arachnoid space into lymph near the cribiform plate and the newly discovered sinus lymphatics to lymph nodes and the blood.
To stimulate this system:
1) Take a big deep belly breath (count to 4)
2) Exhale slowly through the nose (counting to 8)
3) Inhale for 4
4) Exhale for 8 seconds.
5) Repeat 10 times
What did you feel?