Nissl bodies are mainly composed of:
1. Proteins and lipids
2. DNA and RNA
3. Nucleic acids and SER
4. Free ribosomes and RER
| Column I | Column II | |
| 1. | Medulla oblongata | controls respiration and cardiovascular reflexes. | 
| 2. | Limbic system | consists of fibre tracts that interconnect different regions of brain; controls movement. | 
| 3. | Hypothalamus | production of releasing hormones and regulation of temperature, hunger and thirst. | 
| 4. | Corpus callosum | band of fibers connecting left and right cerebral hemispheres. | 
Myelin sheath is produced by
(1) Schwann cells and Oligodendrocytes
(2) Astrocytes and Schwann cells
(3) Oligodendrocytes and Osteoclasts
(4) Osteoclasts and Astrocytes
Receptor sites for neurotransmitters are present on:
1. Pre-synaptic membrane
2. Tips of axons
3. Post-synaptic membrane
4. Membrane of synaptic vesicles