It is present in the connective tissue of the endoneurium, perineurium, and epineurium. These axons are bundled into fascicles surrounded by the perineurium connective tissue layer. Bundles of axons are called fascicles, which are wrapped in perineurium. Smaller branches of these blood vessels penetrate into the perineurium. A funiculus is a small bundle of axons (nerve fibres), enclosed by the perineurium. The perineurium is composed of perineurial cells, which are epithelioid myofibroblasts. A perineurium surrounds that and the outermost layer is considered the epineurium. The epineurium and perineurium remain intact, thus preventing the formation of stump neuroma.