![This is blank.](https://digitalhistology.org/wp-content/themes/histology-unified/imgs/trans.png)
Peripheral nerve: Investments
This cross section of a peripheral nerve is stained with the Masson stain to reveal its investing layers. Individual axons and their sheaths are surrounded by an endoneurium. Groups of axons form a fascicle enclosed by a perineurium. This peripheral nerve, composed of a single fascicle, retains only a thin, fragmented rim of epineurium around its periphery. 400x
![Axons <p>This cross section of a peripheral nerve is stained with the Masson stain to reveal its investing layers. Individual axons and their sheaths are surrounded by an endoneurium. Groups of axons form a fascicle enclosed by a perineurium. This peripheral nerve, composed of a single fascicle, retains only a thin, fragmented rim of epineurium around its periphery. 400x</p>](https://digitalhistology.org/wp-content/uploads/2017/05/T.N.PN-3-4-ping.png)
Axons
This cross section of a peripheral nerve is stained with the Masson stain to reveal its investing layers. Individual axons and their sheaths are surrounded by an endoneurium. Groups of axons form a fascicle enclosed by a perineurium. This peripheral nerve, composed of a single fascicle, retains only a thin, fragmented rim of epineurium around its periphery. 400x
![Myelin sheaths <p>This cross section of a peripheral nerve is stained with the Masson stain to reveal its investing layers. Individual axons and their sheaths are surrounded by an endoneurium. Groups of axons form a fascicle enclosed by a perineurium. This peripheral nerve, composed of a single fascicle, retains only a thin, fragmented rim of epineurium around its periphery. 400x</p>](https://digitalhistology.org/wp-content/uploads/2017/05/T.N.PN-3-5-ping.png)
Myelin sheaths
This cross section of a peripheral nerve is stained with the Masson stain to reveal its investing layers. Individual axons and their sheaths are surrounded by an endoneurium. Groups of axons form a fascicle enclosed by a perineurium. This peripheral nerve, composed of a single fascicle, retains only a thin, fragmented rim of epineurium around its periphery. 400x
![Endoneurium > <p>The endoneurium, stained green with this procedure, surrounds individual axons and consists of loose connective tissue.</p>](https://digitalhistology.org/wp-content/uploads/2017/05/T.N.PN-3-1-ping.png)
Endoneurium >
The endoneurium, stained green with this procedure, surrounds individual axons and consists of loose connective tissue.
![Perineurium <p>This cross section of a peripheral nerve is stained with the Masson stain to reveal its investing layers. Individual axons and their sheaths are surrounded by an endoneurium. Groups of axons form a fascicle enclosed by a perineurium. This peripheral nerve, composed of a single fascicle, retains only a thin, fragmented rim of epineurium around its periphery. 400x</p>](https://digitalhistology.org/wp-content/uploads/2017/05/T.N.PN-3-2-ping.png)
Perineurium
This cross section of a peripheral nerve is stained with the Masson stain to reveal its investing layers. Individual axons and their sheaths are surrounded by an endoneurium. Groups of axons form a fascicle enclosed by a perineurium. This peripheral nerve, composed of a single fascicle, retains only a thin, fragmented rim of epineurium around its periphery. 400x
![Epineurium <p>This cross section of a peripheral nerve is stained with the Masson stain to reveal its investing layers. Individual axons and their sheaths are surrounded by an endoneurium. Groups of axons form a fascicle enclosed by a perineurium. This peripheral nerve, composed of a single fascicle, retains only a thin, fragmented rim of epineurium around its periphery. 400x</p>](https://digitalhistology.org/wp-content/uploads/2017/05/T.N.PN-3-3-ping.png)
Epineurium
This cross section of a peripheral nerve is stained with the Masson stain to reveal its investing layers. Individual axons and their sheaths are surrounded by an endoneurium. Groups of axons form a fascicle enclosed by a perineurium. This peripheral nerve, composed of a single fascicle, retains only a thin, fragmented rim of epineurium around its periphery. 400x