Nerve injury
a. Neuropraxia
- Myelin sheath compressed.
- However, axon and endometrium do not get damaged.
b. Axonotmesis
- Loss of myelin sheath as well as axon.
- Endometrium do not change
- Neuron can grow back from cell body but do not rejoin with terminal end.
- Terminal end will degenerate.
- Eg: in crash injury
c. Neurotmesis
- It is neuropraxia + axonotmesis + damage of endometrium or perineurium or epineurium.
- If Only , endometrium damages à growth is possible
Perineurium damagesà not proper growth
Endometriumdamages à no growth.
- Close proximity of neurons through which nerve impulse are transmitted is known as synapse.