File Name: peripheral nervous system parts and functions .zip
- Nervous System: Anatomy and Function
- The Peripheral Nervous System
The peripheral nervous system PNS is the connection between the central nervous system and the rest of the body. The CNS is like the power plant of the nervous system. It creates the signals that control the functions of the body.
Nervous System: Anatomy and Function
The nervous system can be divided into two major subdivisions: the central nervous system CNS and the peripheral nervous system PNS , shown in [link]. In this section, we focus on the peripheral nervous system; later, we look at the brain and spinal cord. The peripheral nervous system is made up of thick bundles of axons, called nerves, carrying messages back and forth between the CNS and the muscles, organs, and senses in the periphery of the body i. The PNS has two major subdivisions: the somatic nervous system and the autonomic nervous system. The somatic nervous system is associated with activities traditionally thought of as conscious or voluntary.
Skip to content. Skip to navigation. Firstly, with the nervous system there are many new terms you will likely come across, whether its in this section, in other anatomy text books and in the fitness industry. Neurons nerve cells are the building blocks of all nerves. Individual nerves are made up of thousands of neurons. Action potentials are the electrical impulses messages that travel throughout the nervous system. EPSP stands for excitory post-synaptic potential.
The nervous system is classified into the central and peripheral nervous system. The central nervous system CNS consists of the brain and spinal cord, leaving everything else in the peripheral nervous system PNS. The peripheral nervous system is itself classified into two systems: the somatic nervous system and the autonomic nervous system. Each system contains afferent and efferent components. The afferent arm consists of sensory or afferent neurons running from receptors for stimuli to the CNS.
The Peripheral Nervous System
What exactly is the peripheral nervous system and what role does it play in the body? First, it is important to realize that the nervous system is divided into two parts: the central nervous system and the peripheral nervous system. 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. Each part of the system plays a vital role in how information is communicated throughout the body. The peripheral nervous system PNS is the division of the nervous system containing all the nerves that lie outside of the central nervous system CNS.
That suggests it is made of two organs—and you may not even think of the spinal cord as an organ—but the nervous system is a very complex structure. Within the brain, many different and separate regions are responsible for many different and separate functions. It is as if the nervous system is composed of many organs that all look similar and can only be differentiated using tools such as the microscope or electrophysiology.