A description of the nervous system

The parts of a system can be referred to as its elements or components; the environment of the system is defined as all of the factors that affect the system and are affected by it.

The two inferior colliculi are involved in hearing. According to structure neurons may be multipolar neurons, bipolar neurons, and unipolar neurons: In most cases an impulse must cross more than one synapse to cause the desired action. The exception is a sensory neuron that has a single, long dendrite instead of many dendrites.

nervous system

It does not continue through the whole length of the column, terminating instead slightly above the level of the waist. It is processed by the lateral geniculate bodies of the thalamus and sent to the primary visual area in the occipital lobe.

Neurons in the Peripheral Nervous System The smallest worker in the nervous system is the neuron. This highly specialized cell has many fibers extending from it which carry messages in the form of electrical charges and chemical changes. They are part of the extrapyramidal tract.

Nervous System

The central system is the primary command center for the body, and is comprised of A description of the nervous system brain and spinal cord.

It is well protected in this location. The parasympathetic nervous system prevents body processes from accelerating to extremes. The olivary nuclei are posterior to the pyramids. The nuclei of cranial nerve III, the oculomotor cranial nerve, and of cranial nerve IV, the trochlear cranial nerve which both provide innervation for eye movement are also located in the midbrain.

In most cases, the brain is the final destination point for information gathered by the rest of the nervous system.

Muscle spindles, joints and tendons send information about movement back to this area. The Cerebellum The word "cerebellum" means "little brain" in Latin. Thus the body is prepared for an extraordinary effort.

The different parts of the nervous system are constantly interacting, and are so well coordinated that humans can think, feel, and act on many different levels and without serious confusion, all at the same time. The enteric nervous system is a complex network of nerve fibers that innervate the organs within the abdomen like the gastrointestinal tract, pancreas, gall bladder etc.

The surface of the cortex is ridged, as it is made up of gyri and sulci. There are two very important motor relay nuclei in the thalamus: The basic unit of the nervous system is the nerve cell, or neuron.

The whole process takes less than a second to happen. The Thalamus This subcortical structure sits within the brain at the level of the temporal lobe.

For each of the chain of impulses there is one preganglionic neuron, or one before the cell body or ganglion, that is like a central controlling body for numerous neurons going out peripherally. A system and its environment could be considered as a unified whole for purposes of study, or a subsystem could be studied as a system.

The Spinal Cord The spinal cord contains the cell bodies of the spinal nerves as well as their afferent and efferent fibers. Because so many axons join together to pass through this area, the internal capsule is sometimes referred to as a bottleneck of fibers. The Limbic System This is the most ancient and primitive part of the brain.

These neurons can only send information one way. It begins below a large opening in the base of the skull called the magnum foramen and extends downward, surrounded and protected by the vertebral column.

The control centers of these systems lie in the hypothalamus.

It is sometimes called the rhinencephalon as the term "rhino" means nose in Latin and some of this area is dedicated to the processing of olfactory stimuli. These are white segmented covering around axons and dendrites of many peripheral neurons. It is also possible to think of the human body as a living system and the endocrine system as a subsystem.

Peripheral system nerves branch from either the brain stem or the spinal cord. The Hypothalamus The hypothalamus is located immediately below the thalamus. The systems process the collected information and then dispatch instructions to the A description of the nervous system of the body, facilitating an appropriate response.

These secretions, along with epinephrine discharged into the blood by the adrenal medulla, help start muscle action quickly. While the thalamus is mainly an input structure, sending messages to higher brain areas, the hypothalamus is an output structure, sending messages to glands and other parts of the body.

The Neuroscience on the Web Series: Information about smell travels directly to the temporal lobe. The peripheral nervous system consists of a network of nerves that connects the rest of the body to the CNS.nervous system the organ system that, along with the endocrine system, correlates the adjustments and reactions of an organism to internal and environmental mint-body.com is composed of the brain, spinal cord, and nerves, which act together to serve as the communicating and coordinating system of the body, carrying information to the brain.

The two hemispheres of the brain are covered by a layer of cells called the cortex. (Cortex means "bark" in Latin.) The surface of the cortex is ridged, as it is made up of gyri and sulci. A gyrus is a raised fold of tissue.

A sulcus is a groove between two gyri. A particularly deep sulcus is called. The nervous system is a complex network of nerves and cells that carry messages to and from the brain and spinal cord to various parts of the body.

The nervous system includes both the Central nervous system and Peripheral nervous system. The nervous system is a complex collection of nerves and specialized cells known as neurons that transmit signals between different parts of the body.

It is essentially the body's electrical wiring. Structurally, the nervous system has two components: the central nervous system and the peripheral nervous system.

The system of neurons and tissues that regulates the actions and responses of vertebrates and many invertebrates. The nervous system of vertebrates is a complex information-processing system that consists mainly of the brain, spinal cord, and peripheral and autonomic nerves.

The peripheral nervous system consists of a network of nerves that connects the rest of the body to the CNS.

What is the Nervous System?

The two systems work together to collect information from inside the body and from the environment outside it.

A description of the nervous system
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