Epineurium
Encyclopedia
The epineurium is the outermost layer of connective tissue
surrounding a peripheral nerve
. It is made of dense irregular connective tissue and usually contains multiple nerve fascicles
as well as blood vessels which supply the nerve. Smaller branches of these blood vessels penetrate into the perineurium
.
The epineurium is formed when the spinal nerve
leaves the vertebral canal via the intervertebral foramen and 2 layers of the spinal meninges invaginate the nerve - arachnoid and dura - forming a "dural sleeve" which is the epineurium.
Connective tissue
"Connective tissue" is a fibrous tissue. It is one of the four traditional classes of tissues . Connective Tissue is found throughout the body.In fact the whole framework of the skeleton and the different specialized connective tissues from the crown of the head to the toes determine the form of...
surrounding a peripheral nerve
Nerve
A peripheral nerve, or simply nerve, is an enclosed, cable-like bundle of peripheral axons . A nerve provides a common pathway for the electrochemical nerve impulses that are transmitted along each of the axons. Nerves are found only in the peripheral nervous system...
. It is made of dense irregular connective tissue and usually contains multiple nerve fascicles
Nerve fascicle
A small bundle of nerve fibers, enclosed by the perineurium, is called a funiculus; if the nerve is of small size, it may consist only of a single funiculus; but if large, the funiculi are collected together into larger bundles or nerve fascicles, which are bound together in a common membranous...
as well as blood vessels which supply the nerve. Smaller branches of these blood vessels penetrate into the perineurium
Perineurium
In the peripheral nervous system, nerve fibers are each wrapped in a protective sheath known as the endoneurium. These are bundled together into groups known as fascicles, each surrounded by a protective sheath known as the perineurium. Several fascicles may be in turn bundled together with a blood...
.
The epineurium is formed when the spinal nerve
Spinal nerve
The term spinal nerve generally refers to a mixed spinal nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body...
leaves the vertebral canal via the intervertebral foramen and 2 layers of the spinal meninges invaginate the nerve - arachnoid and dura - forming a "dural sleeve" which is the epineurium.
See also
- PerineuriumPerineuriumIn the peripheral nervous system, nerve fibers are each wrapped in a protective sheath known as the endoneurium. These are bundled together into groups known as fascicles, each surrounded by a protective sheath known as the perineurium. Several fascicles may be in turn bundled together with a blood...
- EndoneuriumEndoneuriumThe endoneurium, also referred to as an endoneurial channel, sheath or tube, is a layer of delicate connective tissue made up of endoneurial cells that encloses the myelin sheath of a spinal cord nerve fiber. These are bundled up into groups called nerve fascicles, which have a protective sheath...
- Nerve fascicleNerve fascicleA small bundle of nerve fibers, enclosed by the perineurium, is called a funiculus; if the nerve is of small size, it may consist only of a single funiculus; but if large, the funiculi are collected together into larger bundles or nerve fascicles, which are bound together in a common membranous...
- Connective tissue in the peripheral nervous systemConnective tissue in the peripheral nervous systemA peripheral nerve contains two types of tissue: nerve fibers, and connective tissue. Dendrites and axons with schwann cells and myelin sheath are surrounded by connective tissue. A nerve fiber in the peripheral nervous system consists of an axon or long dendrite, myelin sheath and their schwann...
