The nervous system
Central Nervous System (CNS) | Peripheral Nervous System (PNS) | Sensory- Somatic Nervous System | The Autonomic Nervous System (ANS) | Meninges | See also. The nervous The spinal cord is the main 'superhighway' for signals between the body and the brain. It is protected by the . Relationships * SIFT Model. The peripheral nervous system includes both a voluntary, somatic branch and an Identify the differences between the somatic and autonomic nervous systems Association nerves integrate sensory input and motor output; these nerves. Peripheral Nervous System (PNS) is the system of nerves outside of the and sympathetic nervous system are part of the autonomic nervous system (ANS).
The vertebral column, the collection of bones back bone that houses the spinal cord, is about 70 cm long. Therefore, the spinal cord is much shorter than the vertebral column.
For brain weights of other animals, see brain facts and figures. A stegosaurus dinosaur weighed approximately 1, kg but had a brain that weighed only approximately 70 grams 0. Therefore, the brain was only 0. In contrast, an adult human weighs approximately 70 kg and has a brain that weighs approximately 1. This makes the brain to body ratio of the human times greater than that of the stegosaurus.
Peripheral Nervous System The peripheral nervous system is divided into two major parts: Somatic Nervous System The somatic nervous system consists of peripheral nerve fibers that send sensory information to the central nervous system AND motor nerve fibers that project to skeletal muscle.
- Neuroscience For Kids
- The Nervous System
- Peripheral nervous system
The picture on the left shows the somatic motor system. The cell body is located in either the brain or spinal cord and projects directly to a skeletal muscle. Autonomic Nervous System The autonomic nervous system is divided into three parts: The autonomic nervous system controls smooth muscle of the viscera internal organs and glands.
This picture shows the general organization of the autonomic nervous system.
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The preganglionic neuron is located in either the brain or the spinal cord. This preganglionic neuron projects to an autonomic ganglion.
The autonomic nervous system ANS is concerned with control of involuntary bodily functions. You do not have to think about it to make them work.
Neuroscience For Kids - Explore the nervous system
Meaning, the nerves originate in the spinal cord CNS and go directly to areas in the trunk and that are NOT appendages. These nerves stay within the trunk and effect organs and tissues that automatically work. It regulates the funtion of glands; salivary, gastric, sweat and adrenal glands; smooth muscle tissue that makes up organs and the heart.
Fright or Flight response in the sympathetic nervous system gives vasoconstriction of the part that is supplied, rise in blood pressure, erection of hairs, gooseflesh, pupillary dilation, secretion of small quantities of thick saliva, depression of gastrointestinal activity and acceleration of the heart.
These activities occur in emergencies such as fright and are associated with the expenditure of energy as a response to the need to flee, fight or be frightened.
You can call this "intuition" or "gut feeling. Wine and dine response in the parasympathetic nervous system generally produces vasodilation of the part supplied, general fall in the blood pressure, contraction of the upil, copious secretion of thin saliva, increased gastrointestinal activity, and slowing of the heart.
The parasympathetic nervous calms the body, therefore it is referred to as the "wine and dine" nervous system. The central nervous system, gives rise to the peripheral nervous system the nerves on the periphery of the body.