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The parasympathetic nervous system controls the "rest and digest" functions of the body. It originates in the spinal cord and the medulla and controls homeostasis, or the maintenance of the body's systems. The parasympathetic nervous system is part of the autonomic nervous system. What is the parasympathetic nervous system? The parasympathetic and sympathetic nervous systems, along with the enteric nervous system make up the ANS. which is why we are seldom conscious of it. the beating of the heart, expansion or contraction of blood vessels or pupils, etc. The functions of the ANS are involuntary and reflexive, e.g. The ANS is part of the peripheral nervous system and also has control over some muscles within the body. functions of the internal organs such as the heart, stomach and intestines. The autonomic nervous system (ANS) regulates visceral functions, i.e. Neurons are mostly adrenergic: epinephrine / norepinephrine (acetylcholine) Increases converts glycogen to glucose for muscle energy Increases stomach movement and secretionsĭecreases stomach movement and secretions Functions not critical to survival shut down. Thoracic and lumbar regions of spinal cordĬounterbalance restores body to state of calm.īody speeds up, tenses up, becomes more alert. Sacral region of spinal cord, medulla, cranial nerves 3, 7, 9, and 10 Its general action is to mobilize the body's fight-or-flight response.Ĭontrol the body's response while at rest.Ĭontrol the body's response during perceived threat. The sympathetic nervous system (SNS) is one of two main divisions of the autonomic nervous system (ANS). Its general function is to control homeostasis and the body's rest-and-digest response. The parasympathetic nervous system is one of the two main divisions of the autonomic nervous system (ANS). It is like the key board, monitor, and a printer which passes information in and out in a computer.Comparison chart Parasympathetic nervous system versus Sympathetic nervous system comparison chart The Peripheral Nervous System connects the outer portions of the body with CNS. It exchanges several messages between brain and the body.It connects higher brain centers to and from and regulates reflexes.It has basically two important functions: Spinal cord is a rope like segment about the thickness of a pencil connects nerves tissues extending down the back. Forebrain: The information after hindbrain and midbrain travels to the forebrain.

Midbrain: It is a small area that serves as a centre for several postural reflexes, associated with the senses.Medulla oblongata, pons and cerebellum are the three major structures of the hindbrain. It is the lowest part of the brain regulating the routine “housekeeping” function for daily activities. Hindbrain: The information received by the spinal cord is passed through hindbrain.It contains three importance divisions: Hindbrain, Midbrain, and the Forebrain. It is also called old brain because its evolutionary aspect can be traced to more than 500 million years back. PNS also has two subdivisions: Automatic nervous system and somatic nervous system.īrain and the spinal cords are the two important parts of the CNS. CNS can further be sub-divided into brain and spinal cord. Nervous system can be divided into two major divisions: Central nervous system ( CNS) and the Peripheral Nervous System (PNS). Finally, coordinate to adapt to that changed situation.It circulates the changed information all over the body.Neuron receives the change that occurs around the environment of an organism.example:- if we touch candle flame for more than an instant, pain nerves(receptors)in our finger sent a message up through our hand and arm to the spinal cord and brain Responsible for all activities of nervous system thus guides in our behaviors.structural and functional unit of nervous system that processes and transmits information of nervous system.Information travels in the nervous system through three types of neurons: Sensory Neurons, Motor Neurons, and Inter Neuron. The human brain is composed of about 150 billion nerve cells. neuron and glial cell where glia cell provide a mechanical framework supporting the network of neurons. It is composed mainly of two types of cells i.e. The nervous system is composed of two kinds of cells, the glial cells and nerve cells. The complex network of neurons that regulates bodily processes and responsible for all aspects of conscious experience. It is the sum totals of the tissues that record and distribute information within individual. The human body is composed of different types of cells like bone cells, muscle cells, body cells, etc.