The nerves that make up the peripheral nervous system are actually the axons or bundles of axons from nerve cells or neurons. These arise from the spinal cord. These nerve roots are named according to the spinal vertebrata which they are adjacent to. The phrenic nerve is a nerve essential for our survival which arises from nerve roots C3, C4 and C5. These processes are beyond our conscious control. In the cervical region, the spinal nerve roots come out above the corresponding vertebrae (i.e., nerve root between the skull and 1st cervical vertebrae is called spinal nerve C1). The nervous system transmits signals between the brain and the rest of the body, including internal organs. In some cases, these nerves are very small but some nerve bundles are so large that they can be easily seen by the human eye. The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body. Also refer: Peripheral Nervous System [5] There is a lesser known division of the autonomic nervous system known as the enteric nervous system. It is made up of two sets of nerves It is made up of two sets of nerves [3] Cranial nerve ganglia originated in the CNS. The nervous system is a pathway for signals or nerve impulses. (Source – Wikipedia) Nerves . For descriptive purposes this plexus is usually divided into three parts: The autonomic nervous system (ANS) controls involuntary responses to regulate physiological functions. It is made up of the central nervous system and the peripheral nervous system. The PNS has two major subdivisions: the somatic nervous system and the autonomic nervous system. It consists of the brain and the spinal cord. The peripheral nervous system (PNS) is one of two components that make up the nervous system of bilateral animals, with the other part being the central nervous system (CNS). The Sympathetic nervous system and Parasympathetic nervous system fall under the autonomic nervous system. The peripheral nervous system (SNP) is the part of the nervous system that is made up of nerves and neurons that are outside the brain and spinal cord. Twelve pairs of nerves make up the cranial nervous system. The peripheral nervous system is a channel for the relay of sensory and motor impulses between the central nervous system on one hand and the body surface, skeletal muscles, and internal organs on the other hand. In other words, it is the autonomic system that controls aspects of the body that are usually not under voluntary control. [6] Consequently, when the parasympathetic system dominates the body, there are increases in salivation and activities in digestion, while heart rate and other sympathetic response decrease. Read our, Medically reviewed by Daniel B. peripheral nervous system. In some cases, these nerves are very small but some nerve bundles are so large that they can be easily seen by the human eye. The Nervous System transmits signals between the brain and the rest of the body, including internal organs. [6], The sympathetic system is activated during a “fight or flight” situation in which mental stress or physical danger is encountered. First, it is important to realize that the nervous system is divided into two parts: the central nervous system and the peripheral nervous system. Central Nervous System (CNS) is often called the central processing unit of the body. The PNS has two major subdivisions: the somatic nervous system and the autonomic nervous system. [5] The autonomic nervous system is always activated, but is either in the sympathetic or parasympathetic state. [5] The most notable physiological effects from autonomic activity are pupil constriction and dilation, and salivation of saliva. The nervous system is made up of the brain, the spinal cord, and a large network of nerves that covers all parts of the body. This allows communication between the body and the CNS. The somatic system is the part of the peripheral nervous system responsible for carrying sensory and motor information to and from the central nervous system. The brain controls most body functions, including awareness, movements, sensations, thoughts, speech and memory. The neuron consists of a cell body that … Question 4 Q: The nervous system is made up of the: • Peripheral nervous system • Central nervous system • Proximal nervous system • A and B (correct answer) • A and C Question 5 Q: Excretion is one function of the digestive system. The anterior divisions of the lumbar nerves, sacral nerves, and coccygeal nerve form the lumbosacral plexus, the first lumbar nerve being frequently joined by a branch from the twelfth thoracic. 29 The peripheral nervous system is made up of extensions from the central nervous system known as: A) nerves. The central nervous system includes the brain and spinal cord, while the peripheral nervous system includes all of the nerves that branch out from the brain and spinal cord and extend to other parts of the body including muscles and organs. Key Terms. The autonomic nervous system is a 'self-regulating' system which influences the function of organs outside voluntary control, such as the heart rate, or the functions of the digestive system. Alternatively, if a nerve is in an area with a fixed size it may be trapped if the other components increase in size, such as carpal tunnel syndrome and tarsal tunnel syndrome. This sub-system consists of sensory neurons, ganglia (clusters of neurons), and nerves that connect the central nervous system to arms, hands, legs, and feet. These include the greater occipital nerve, which provides sensation to the back of the head, the lesser occipital nerve, which provides sensation to the area behind the ears, the greater auricular nerve and the lesser auricular nerve. Without the nervous system our brain would be mush. It is important to note that this method creates a problem when naming the spinal nerve root between C7 and T1 (so it is called spinal nerve root C8). Your central nervous system (CNS) is made up of your brain and your spinal cord, and is one of two parts of your nervous system. Peripheral nervous system: definition. These nerves extend from the central nervous system to the outermost areas of the body. [5] The brain and spinal cord of the central nervous system are connected with organs that have smooth muscle, such as the heart, bladder, and other cardiac, exocrine, and endocrine related organs, by ganglionic neurons. They are made up of bundles of nerve fibers supported by delicate areolar tissue. • Controls the ability to move, breathe, see, think and more. The brain is one of the important, largest and central organ of the human nervous system. A) depolarization; potassium B) repolarization: potassium C) depolarization: sodium D) repolarization; sodium 31 Neurotransmitters at excitatory fast synapses tend to the rate of … The main function of the PNS is to connect the CNS to the limbs and organs, essentially serving as a relay between the brain and spinal cord and the rest of the body. The central nervous system (CNS) is made up of the brain and spinal cord. 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