Outside the brain and spinal cord there are aggregations of cell bodies of neurons called ganglia. There are two main types of ganglia. They are sensory and autonomic ganglia. A) Sensory ganglia These ganglia are present on the dorsal nerve roots of spinal nerves, where they are called dorsal nerve root ganglia or spinal ganglia. … Read more
Nerves are the communication lines for transmitting impulses from one part of the body to another. They are elongated, slender, thread-like structures arising from the brain and spinal cord. They vary in length i.e. from 0.1 mm to several metres. In certain cases they may be almost equal to the body length. They are of … Read more
S.N Medullated nerve fibre Non-medullated nerve fibre 1. It is also known as myelinated nerve fibre. It is also known non-myelinated nerve fibre. 2. The nerve fibre with medullary sheath is called medullated fibre. The nerve fibre without medullary sheath is called non-medullated nerve fibre. 3. It is found in white matter of brain … Read more
S.N Axons Dendrites 1. They take message away from the cell body. They bring information to the cell body. 2. They have smooth surface. They have rough surface due to dendritic spines. 3. Generally there is one axon per cell. Usually many dendrites per cell. 4. Nissl’s granules are absent . Nissl’s granules are present … Read more