 Sheath around nerve fasciculi | |
| TA98 | A14.2.00.015 |
|---|---|
| TA2 | 6156 |
| FMA | 52585 |
The perineurium is a protective sheath that surrounds a nerve fascicle.1 This layer bundles together the axons targeting the same anatomical location.1 The perineurium is composed of fibroblasts.2
In the peripheral nervous system, the myelin sheath of each axon in a nerve is wrapped in a delicate protective sheath known as the endoneurium. Fascicles, bundles of , are surrounded by the perineurium. Several fascicles may be in turn bundled along with and within yet another sheath, the . This grouping structure is analogous to the muscular organization system of , and .