The transparent fibrous membrane that forms a tube around and adheres to the surface of the spinal cord and brain is called the pia mater.
Spinal cord is the backbone of vertebrates. It help in keeping the body erect and providing a perfect posture. The backbone begins from the base of the brain and extends till the the tail region. The spinal cord also helps in carrying the signals from and to the brain. The spinal cord is made up of 5 types of bones that are total 33 in number.
Pia mater is the innermost membrane of the coverings surrounding the brain and the spinal cord. It is also involved in the production of cerebrospinal fluid. It consists of a sheet of flat cells that are considered to be impermeable.
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