Human Body Nerves systems, Function and Nerves Structures

 



What is the Nerve 

The nervous system is the most complex and highly organized body system. It receives information from the sensory organs via nerves. transmits the information through the spinal cord, and processes it in the brain. the nervous system directs our body's reaction to the world and also controls most of our internal function everything from muscle movement and blood vessel dilation to the learning of  anatomy and physiology facts. how does it manage all this by sending lightning quick signals, electrical and chemical, between cells. 

The central nervous system consists of the brain and spinal cord. The brain plays a central role in the control of most bodily functions, including awareness, movement sensation, thoughts, speech, and memory. some reflex movements can occur via spinal cord pathways without the participation of brain structures. Reed more Central Nervous System


Structure of a Nerve


Nerves are the organs that make up the peripheral nervous system. it consists of a cord like structure with multiple nervous fibers (also called axons), wrapped in layers of tissue and fat. this axon has layers of connective tissue around it. this connective tissue is called the endoneurium. this entire nerve is further enclosed in another layer of connective tissue called the epineurium.

TYPES OF NERVES:


There are three types of nerves in the human body which are classified based on their functions. these are the sensory nerves, motor nerves and mixed nerves.

Sensory Nerves:


These are the nerves that send message to the brain or the spinal cord from the sense organs. these are enclosed in the from of a bundle like structures or nerves fibres in the peripheral nerves system. they carry information from the PNS to the CNS.

Motor Nerves :

Motor nerves are these nerves those that carry the message in the from of a response from the brain or the spinal cord to other parts of the body such as the muscles and glands. they are responsible for carrying the information from the CNS to the PNS. Reed more Peripheral Nervous System

Mixed Nerves :

Mixed nerves are the nerves that perform both the action of sensory nerves as well as a motor nerve. they transform electrical impulses from the central nervous system to the muscles of the body. generally, the mixed nerves transmit impulses at the rate of 120 meters per seconds or 432 kilometers per hour.

Nerves Disorders:

Nerve disorders include:

  1. Pain
  2. Muscle malfunction
  3. Changes in sensation 
  4. Changes in the senses
  5. Vertigo
  6. Dysarthria
  7. Sleeping problems
  8. Mental disability


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