Question

give me an exact , excellent definition of neurilemma and axon hillock​

Answer 1

NEURILEMMA :-The axon of nerve fibres outside the CNS (CENTRAL NERVOUS SYSTEM) is covered with nucleated cytoplasmic layer of Schwann cells called as NEURILEMMA or NEUROLEMMA.

AXON HILLOCK :- It is the junctional part of the cyton (cell body of a neurone) and the axon bearing a funnel shaped structure.

Answer 2

Neurilemma (also known as neurolemma, sheath of Schwann, or Schwann's sheath)[1] is the outermost nucleated cytoplasmic layer of Schwann cells (also called neurilemmocytes) that surrounds the axon of the neuron. It forms the outermost layer of the nerve fiber in the peripheral nervous system.[2]

Neurilemma

Gray631.png

Diagram of longitudinal sections of medullated nerve fibers.

Myelin sheath (1).svg

Cross section of an axon.

1. Axon

2. Nucleus of Schwann cell

3. Schwann cell

4. Myelin sheath

5. Neurilemma