The peripheral nervous system consists of the nerves that branch out from the brain and spinal cord. These nerves form the communication network between the CNS and the body parts. The peripheral nervous system is further subdivided into the somatic nervous system and the autonomic nervous system.
What does the peripheral nervous system consist of?
The peripheral nervous system refers to parts of the nervous system outside the brain and spinal cord. It includes the cranial nerves, spinal nerves and their roots and branches, peripheral nerves, and neuromuscular junctions.
What are the 2 components of the peripheral nervous system?
The peripheral nervous system (PNS) has two components: the somatic nervous system and the autonomic nervous system. The PNS consists of all of the nerves that lie outside the brain and spinal cord.
What are the types of peripheral nervous system?
The peripheral nervous system is divided into two main parts: Autonomic nervous system (ANS): Controls involuntary bodily functions and regulates glands. Somatic nervous system (SNS): Controls muscle movement and relays information from ears, eyes and skin to the central nervous system.
What organs are involved in the peripheral nervous system?
The organs of the peripheral nervous system are the nerves and ganglia. Nerves are bundles of nerve fibers, much like muscles are bundles of muscle fibers. Cranial nerves and spinal nerves extend from the CNS to peripheral organs such as muscles and glands.
Where is the peripheral nervous system located?
The peripheral nervous system refers to the parts of the nervous system that are outside the central nervous system, that is, those outside the brain and spinal cord.
Where does the peripheral nervous system start?
These arise from the spinal cord. Usually these arise as a web (“plexus”) of interconnected nerves roots that arrange to form single nerves. These nerves control the functions of the rest of the body.
What are the four parts of the peripheral nervous system?
The PNS is divided into the somatic and autonomic nervous systems. The somatic system controls voluntary activities, whereas the autonomic system controls involuntary activities. The autonomic nervous system is further divided into sympathetic, parasympathetic, and enteric divisions.
What is the difference between PNS and CNS?
The CNS includes the brain and spinal cord. The brain is the body’s “control center.” The CNS has various centers located within it that carry out the sensory, motor and integration of data. … The PNS is a vast network of spinal and cranial nerves that are linked to the brain and the spinal cord.
What is the central and peripheral nervous system?
Overview. The central nervous system comprises the brain and spinal cord. The peripheral nervous system includes all peripheral nerves.
What is the function of peripheral nerve?
The peripheral nervous system is a network of 43 pairs of motor and sensory nerves that connect the brain and spinal cord (the central nervous system) to the entire human body. These nerves control the functions of sensation, movement and motor coordination. They are fragile and can be damaged easily.
How does caffeine affect the peripheral nervous system?
Specifically, caffeine enhances the release of neurotransmitters such as catecholamines, serotonin and acetylcholine, associated with vasoconstriction in the brain and vasodilatation in peripheral organs (5,13). Accordingly, it decreases cerebral blood flow (15) and increases brain metabolism.
How are peripheral nerves classified?
Peripheral nerve fibers are grouped based on the diameter, signal conduction velocity, and myelination state of the axons. These classifications apply to both sensory and motor fibers. Fibers of the A group have a large diameter, high conduction velocity, and are myelinated.
What happens if the peripheral nervous system is damaged?
Symptoms of PNS damage include problems with sexual function, bladder control, blood pressure regulation, digestion and loss of sensation in the hands and feet.
What protects the peripheral nervous system?
Unlike the brain and the spinal cord of the central nervous system that are protected by the vertebrae and the skull, the nerves and cells of the peripheral nervous system are not enclosed by bones, and therefore are more susceptible to trauma.
Which is not part of the peripheral nervous system?
Which of the following is NOT part of the peripheral nervous system? spinal cord The spinal cord is part of the central nervous system, not the peripheral. … Which type of glial cells form the myelin sheath in the PNS? Schwann cells Schwann cells form the myelin sheath in the PNS.