The three layers are outer epineurium, middle perineurium, and inner endoneurium; posterior ramus, anterior ramus, and rami communicantes
A connective tissue sheath called the epineurium surrounds each nerve. Each bundle of nerve fibers is called a fasciculus and is surrounded by a layer of connective tissue called the perineurium.The brain and spinal cord are invested by three layers of connective tissues called the meninges that provide protection against traumatic forces. These layers are dura mater, pia mater and arachnoid.There are three layers of meninges around the brain and spinal cord. The outer layer, the dura mater, is tough white fibrous connective tissue. The middle layer of meninges is arachnoid, which resembles a cobweb in appearance, is a thin layer with numerous threadlike strands that attach it to the innermost layer.
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