Among various types of organ systems, the nervous system is one of the most important one in human body. It is responsible for producing, controlling and guiding our thoughts and responses to the world around us according to James W. Pennebaker (2012). During embryological development, the cells that form nervous system are incredibly specialised and work complexly than the cells that form skin or other body parts. Neurosecretory cells are one of the examples of specialised nervous system cells that produce neurosecretions. Neurosecretions are hormones which carry information from sensor cells to target cells and they can be released directly into the bloodstream according to Rene Fester Kratz, Donna Rae Siegfried (2010). The nervous system consists of two main parts: central nervous system (CNS) and peripheral nervous system (PNS) where CNS consists of the brain and spinal cord whereas PNS consists of ganglia and nerves which connect CNS to different parts of the body. The main function of the nervous system is to coordinate the voluntary and involuntary actions of the human body and transmit signals between different parts of the body.
The components of the CNS are protected by three layers of connective tissue called the meninges which are: the outer dura mater, the arachnoid membrane and the inner pia mater. Within the CNS, there is a system of hollow cavities called ventricles which are filled with cerebrospinal fluid. This acts as cushion and protects the components of CNS and also assists in the circulation of nutrients to the brain.
The peripheral nervous system is divided into ...
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