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Subdivisions Nervous System

The nervous system can 'be divided into "systems" that are connected to each other and work together. Comic Con over the division ' simple The Nervous System and ' divided in: Central Nervous System and Peripheral Nervous System Now we consider separately the central nervous system and peripheral and divide them into further parties.

Central Nervous System

The central nervous system and 'divided into two main parts: the brain and spinal cord . Adult human, the brain weighs on average 1.3 to 1.4 Kg ceervello contains about 100 billion nerve cells (neurons) and trillions of "support cells, called glia . The spinal cord and 'long about 43 cm in adult women and adult human 45 cm and weighs about 35-40 g. The spine, the series of bones (back bone) that houses the spinal cord, and 'long about 70 cm, so' that the spinal cord and 'much more' short vertebral column.

\u0026lt;tr> \u0026lt;td align="middle" colspan="2"> Peripheral Nervous System \u0026lt;/ td> \u0026lt;/ tr> \u0026lt; tr> \u0026lt;td> The peripheral nervous system is divided into two main parts: the somatic nervous system and autonomic nervous system, more 'a third part, called the enteric nervous system . \u0026lt;/ td> \u0026lt;td width="50%"> \u0026lt;/ td> \u0026lt;/ tr> \u0026lt;td \u0026lt;tr> bgcolor="#ffffcc" colspan="2">

1. The somatic nervous system

The somatic nervous system and 'consists of peripheral nerve fibers that send sensory information to the central nervous system and motor nerve fibers that lead to the muscles skeletal.

The left figure shows the organization of the somatic motor system. The cell body is located in brain or spinal cord and projects directly to a skeletal muscle.

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2. Autonomic Nervous System

The autonomic nervous system and 'divided into three parts: the sympathetic (or funny), the parasympathetic and enteritis. The autonomic nervous system controls the smooth muscle of the viscera (internal organs) and glands.

The figure shows the general arties of the autonomic nervous system. The preganglionic neuron can be 'found in both brain that in the spinal cord and projects to a neuron that is located outside the central nervous system, in a autonomic ganglia. The fiber of this postganglionic neuron then projects to the target organ.

Note that somatic nervous system has only one neuron in the central nervous system and the target organ, and the autonomic nervous system uses 2 neurons .

DEPTH

\u0026lt;/ td> \u0026lt;/ tr> \u0026lt;td colspan="2"> \u0026lt;tr> The s ystem enteric nervous and 'the third division of the autonomic nervous system.

The enteric nervous system is a maze of nerve fibers that innervate the viscera (gastrointestinal tract, pancreas, gallbladder).

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