It includes the nerves that arise from the brain and spinal cord. There are twelve pairs of nerves which directly arise from the brain and called cranial nerve. Similarly, there are 31 pairs of nerves that arise from the spinal cord and called spinal nerve. They connect the organ system to the brain.
It is the system of ganglion and sub-ganglion. The local swelling of nerves in organs are called ganglion and further swelling of nerves to various part of the organ is called sub-ganglia. It is divided into sympathetic and parasympathetic nervous system. The function of ANS is to maintain body steady state rapidly.
Cranial Nerves: They arise from brain and terminate inside it except the Vague. There are 12 pairs of cranial nerves in human beings. They control the activities of eyes ears and tongue etc.
Spinal nerves: They arise from the spinal cord and spread to different parts of the body. There are 31 pairs of spinal nerves in the human beings. Out of them,8 are cervical 12 are thoracic 5 pairs of lumbar 5 pairs of sacral and 1 pair coccygeal nerves.
There are 12 pairs of cranial nerves and 31 pairs of spinal nerves in human body.
The nerves that arise from brain and terminate inside it except the Vague is called cranical nerves.
The glands in human body produce different hormones or enzymes. With the help of glands, different body parts function in proper way.
The rapid conduction of message in the form of electrical impulses from one part of the body to another and co-ordination of the body activity is called nervous system.
The endocrine glands do not bear a duct and the hormones produced from them are directly mixed up with the blood. The exocrine glands bear duct.
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