What is nervous tissue?
Nervous Tissue. Nervous tissue is made up of nerve cells or neurons.
Each neuron has a single long part called the axon and many short branches celled the dendrites.
The cell body contains a distinct nucleus and has a special kind of granule, called Nissl’s granule in the cytoplasm.
In some nerve cells the axon has a thick white covering called medullary sheath. These are called medullated fibres. When this sheath is absent, it is called non-medullated fibres.
In the medullated fibres, the sheath is not continuous—there are gaps along the entire length. Each gap is called Nodes of Ranvier.
The terminal end of axon is without sheath and branched. The axon of one neuron remains in contact with the branches of dendrites from another neuron. The region of contact is called synapse.
Each nerve cell receives message through the dendrites and sends message through the axon.
Nerve cell.
