The optic nerve is ensheathed in all three arachnoid, and pia mater ) rather than the epineurium, perineurium, and endoneurium found in peripheral nerves.
12.
The perineurium is cellular, and is composed of perineurial cells, which are epithelioid and myofibroblastoid properties including tight junctions, gap junctions, external laminae and contractility.
13.
Axonotmesis involves loss of the relative continuity of the axon and its covering of myelin, but preservation of the connective tissue framework of the nerve ( the encapsulating tissue, the epineurium and perineurium, are preserved ).
14.
The deep fasciae envelop all bone ( periosteum and endosteum ); cartilage ( perichondrium ), and blood vessels ( tunica externa ) and become specialized in muscles ( epimysium, perimysium, and endomysium ) and nerves ( epineurium, perineurium, and endoneurium ).
