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.