Thus somatic nervous system consists of two parts:
- Spinal nerves: They are peripheral nerves that carry sensory information into and motor commands out of the spinal cord.
- Cranial nerves: They are the nerve fibers that carry information into and out of the brain stem.
The somatic system is the part of the peripheral nervous system that is responsible for carrying motor and sensory information both to and from the central nervous system. This system is made up of nerves that connect to the skin, sensory organs, and all skeletal muscles.
The nervous system has three main functions:
- To collect sensory input from the body and external environment.
- To process and interpret the sensory input.
- To respond appropriately to the sensory input.
Parasympathetic nervous system: the part of your nervous system that unconsciously controls your organs and glands when your body is at rest. Peripheral nervous system (PNS): a part of the nervous system which includes all the nerves outside of the brain and spinal cord.
The sensory nervous system is a part of the nervous system responsible for processing sensory information. A sensory system consists of sensory neurons (including the sensory receptor cells), neural pathways, and parts of the brain involved in sensory perception.
Specifically, the somatic nervous system is responsible for movement of voluntary muscles and the process known as a reflex arc. This system carries nerve impulses back and forth between the central nervous system, which is the brain and the spinal cord, and the skeletal muscles, skin, and sensory organs.
The somatic nervous system (SoNS) is the part of the peripheral nervous system associated with the voluntary control of body movements through the skeletal muscles and mediation of involuntary reflex arcs. The ANS can be subdivided into the parasympathetic nervous system (PSNS) and the sympathetic nervous system (SNS).
The sensory-somatic nervous system is composed of cranial and spinal nerves and contains both sensory and motor neurons. Sensory neurons transmit sensory information from the skin, skeletal muscle, and sensory organs to the central nervous system (CNS).
Somatic motor neurons. Somatic motor neurons originate in the central nervous system, project their axons to skeletal muscles (such as the muscles of the limbs, abdominal, and intercostal muscles), which are involved in locomotion.
The sensory-somatic nervous system is made up of cranial and spinal nerves and contains both sensory and motor neurons. Sensory neurons transmit sensory information from the skin, skeletal muscle, and sensory organs to the CNS.
- Alzheimer's disease.
- Amyotrophic lateral sclerosis.
- Friedreich's ataxia.
- Huntington's disease.
- Lewy body disease.
- Parkinson's disease.
- Spinal muscular atrophy.
Body functions stimulated by the parasympathetic nervous system (PSNS) include sexual arousal, salivation, lacrimation, urination, digestion, and defecation. The PSNS primarily uses acetylcholine as its neurotransmitter.
When a nerve impulse reaches the end of an axon, the axon releases chemicals called neurotransmitters. Neurotransmitters travel across the synapse between the axon and the dendrite of the next neuron. Neurotransmitters bind to the membrane of the dendrite.
Peripheral nervous system: The portion of the nervous system that is outside the brain and spinal cord. Abbreviated PNS. The nerves in the PNS connect the central nervous system (CNS) to sensory organs, such as the eye and ear, and to other organs of the body, muscles, blood vessels, and glands.
The parasympathetic nervous system (PSNS) is a division of the autonomic nervous system (ANS), along with the sympathetic nervous system (SNS) and enteric nervous system. After the sympathetic nervous system gets the body ready for action, the parasympathetic calms it back down.
The autonomic nervous system also has two divisions: the sympathetic division and the parasympathetic division. These two divisions have antagonistic (opposing) effects on the internal organs they innervate (send nerves to = act on). The sympathetic division, shown at the left, is the emergency system.
The nervous system consists of two main parts: the central nervous system and the peripheral nervous system: The central nervous system is made up of the brain and spinal cord.
Cranial - connects the brain with the periphery or spinal - connects the spinal cord with the periphery. Somatic - connects the skin or muscle with the central nervous system or visceral - connects the internal organs with the central nervous system.
The somatic nervous system is responsible for skeletal muscle movement. A motor impulse moves through the body by sending the signals from neuron to neuron via the synapse, then the signal is sent to the muscle or gland has a reaction response.
The sympathetic nervous system (SNS) is part of the autonomic nervous system (ANS), which also includes the parasympathetic nervous system (PNS). The sympathetic nervous system activates what is often termed the fight or flight response.
There are three parts to your autonomic nervous system: 1 The sympathetic system is responsible for your body's 'fight or flight' reaction. 2 The parasympathetic system looks after the workings of your body during rest and recuperation. It also controls your heart rate and body temperature under normal conditions.