In the peripheral nervous system a bundle of axons is called a nerve. In the central nervous system a bundle of axons is called a tract. Each axon is surrounded by a delicate endoneurium layer. The course connective tissue layer called perineurium, binds the fibers into bundles called fascicles.
Just so, what surrounds a bundle of nerve fibers?
Motor nerves have only efferent fibers, long axons of motor neurons. 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.
What are the 3 layers of connective tissue around a nerve?
The three layers of connective tissue surrounding each nerve are:
- Endoneurium. Each nerve axon, or fiber is surrounded by the endoneurium, which is also called the endoneurial tube, channel or sheath.
What is the connective tissue wrapping that surrounds bundles fascicles of axons?
The axons are bundled together into groups called fascicles. Each fascicle is wrapped in a layer of connective tissue called the perineurium. Finally, the entire nerve is wrapped in a layer of connective tissue called the epineurium.