The falx cerebri is a fold of dura mater, not a separate layer of the meninges.

The dura mater is the tough, fibrous outermost layer of the meninges.

The pia mater is the innermost layer of the meninges and is directly adjacent to the brain and spinal cord.

The arachnoid mater is a thin, web-like layer of the meninges that produces cerebrospinal fluid.

The dura mater does not produce cerebrospinal fluid. The arachnoid mater is responsible for producing cerebrospinal fluid.

The subdural space is the space between the dura mater and the arachnoid mater.

The subarachnoid space is the space between the arachnoid mater and the pia mater.

The cerebrospinal fluid is a clear, colorless fluid that fills the ventricles of the brain and the subarachnoid space. It helps to protect the brain and spinal cord from injury.

Encephalitis is an inflammation of the brain, not the meninges.

Bacteria are the most common cause of meningitis.

The symptoms of meningitis can include fever, headache, stiff neck, nausea and vomiting, and sensitivity to light.

Meningitis is treated with antibiotics if it is caused by bacteria.

The complications of meningitis can include brain damage, hearing loss, vision loss, seizures, and death.

Meningitis can be prevented by vaccination, good hygiene, and avoiding contact with sick people.

The prognosis for meningitis depends on the cause of the infection and the severity of the disease.