Nervous System and Neurons

Yes, this is the correct answer. The stimulus to the nerve supplying the muscle can be thermal, electrical, mechanical or chemical in nature.

The cytoplasm of a nerve cell is called neuroplasm.

Nervous tissue is composed of specialized cells called neurons, which transmit message from all parts of the body to brain and spine and vice - versa.

A neuron comprises the cyton or cell body, a tail-like structure called the axon and dendrites that are short fibre-like structures arising from the cyton.

A neurons which conducts nerve impulses towards the central nervous system is called afferent neuron.

The effector of a reflex is always a muscle.

The chemical substance that is released in a synapse during the transmission of a nerve impulse is acetylcholine.

The receptors of the skin which respond to pressure are called 1st cranial nerve.

The outside of the brain and the inside of the spinal cord are composed chiefly of Grey matter.

The longest cranial nerve which innervates regions of body other than the head is vagus nerve.

The spinal nerves have the cell bodies of their afferent fibres in dorsal root of spinal cord.

 Synapse is the junction of neurons.

Sensory nerve fibres enter the spinal cord through dorsal root.

There are 31 pairs of spinal nerves in the human body. The spinal nerves are grouped according to where they leave the vertebral column. There are eight pairs of cervical nerves (C1-C8), twelve pairs of thoracic nerves (T1-T12), five pairs of lumbar nerves (L1-L5), five pairs of sacral nerves (S1-S1) and one pair of coccygeal nerves (Co1).

It contains densely packed nerve cells called neurons, which are specialised for conduction of nerve impulses. Each nerve cell is called a neuron. These are highly specialised cells. They have the ability to receive stimulus from within or outside and send impulses to different parts of the body. Each cell consists of three parts, the cyton or the cell body, the dendrons which are short processes arising from the cyton and further branch into thin dendrites, and the axon which is a single long cylindrical process forming fine branches terminally. Dendrites receive impulses and the axon takes impulses away from the cell body.