Nissl’s substance is composed of:
|A||Rough endoplasmic reticulum|
|B||Nerve cell vesicles|
|D||Deposits of pigmented granules|
The nerve cell body (or soma) of the neuron
a. Nucleus ~ Nucleus contain one nucleus and no centrosome..
b. Nissl bodies:
i. also called Tigroid substances Q
ii. present all over the soma except the axon hillock Q, and they extend to some extent in the dendrites.
iii. (Hi) They are basophilic Q granules,
iv. Nissl granules are organelles containing ribosomes (RNA + protein). They are similar to the rough - surface membranes found in the cytoplasm of most cells which collectively makes up the endoplasmic reticulum or ergastoplasm of the cell. (Samson Wright 13th/261)
v. Nissl granules disappear or degenerate when the neuron is fatigued, Anoxic or injured - k/a Chromatolysis. Q
c. Mitochondria ~ present in soma as well as in axon.
d. Golgi apparatus ~ stained by silver chromate impregnation techniques