Peripheral Nervous System

Definition: Peripheral Nervous System

Peripheral Nervous System

Noun

1. The section of the nervous system lying outside the brain and spinal cord.

Specialty Definitions: Peripheral Nervous System

Domain	Definitions
Health	The nervous system outside of the brain and spinal cord. The peripheral nervous system has autonomic and somatic divisions. The autonomic nervous system includes the enteric, parasympathetic, and sympathetic subdivisions. The somatic nervous system includes the cranial and spinal nerves and their ganglia and the peripheral sensory receptors. (references)
Medicine	The part of the nervous system composed of nerves and ganglia, being branched from the central nervous system into all parts of the organism. Source: European Union. (references)
Source: compiled by the editor from various references; see credits.

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Specialty Definition: Peripheral nervous system

(From Wikipedia, the free Encyclopedia)

The peripheral nervous system or PNS, is part of the nervous system, and consists of the nerves and neurons that reside or extend outside the central nervous system--to serve the limbs and organs, for example. The peripheral nervous system is further divided into the somatomotoric nervous system and the autonomic nervous system.

Specific nerves

Cranial nerves originate from the brainstem, and mainly control the functions of the anatomic structures of the head.

Spinal nerves take their origins from the spinal cord. They control the functions of the rest of the body. In humans, there are 31 pairs of spinal nerves: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral and 1 coccygeal. The naming convention for spinal nerves is to name it after the vertebra immediately above it. Thus the fourth thoracic nerve originates just below the fourth thoracic vertebra. This convention breaks down in the cervical spine. The first spinal nerve originates above the first cervical vertebra and is called C1. This continues down to the last cervical spinal nerve, C8. There are only 7 cervical vertabra and 8 cervical spinal nerves.

The first 4 cervical spinal nerves, C1 through C4, split and recombine to produce a variety of nerves that subserve the neck and back of head. Spinal nerve C1 is called the suboccipital nerve which provides motor innervation to muscles at the base of the skull. C2 and C3 form many of the nerves of the neck, providing both sensory and motor control. 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. See occipital neuralgia. The phrenic nerve arises from nerve roots C3, C4 and C5. It innervates the diaphragm, enabling breathing. If the spinal cord is transected above C3, then spontaneous breathing is not possible. See myelopathy

The last 4 cervical spinal nerves, C5 through C8, and the first thoracic spinal nerve, T1,combine to form the brachial plexus, a tangled array of nerves, splitting, combining and recombining, to form the nerves that subserve the arm and upper back. Although the brachial plexus may appear tangled, it is highly organized and predictable, with little variation between people. See brachial plexus injuries.

The first nerve off the brachial plexus is the dorsal scapular nerve, arising from C5 nerve root, and innervating the rhomboids and the levator scapulae muscles. The long thoracic nerve arises from C5, C6 and C7 to innervate the serratus anterior. The brachial plexus first forms three trunks, the superior trunk, composed of the C5 and C6 nerve roots, the middle trunk, made of the C7 nerve root, and the inferior trunk, made of the C8 and T1 nerve roots. The suprascapular nerve is an early branch of the superior trunk. It innervates the suprascapular and infrascapular muscles, part of the rotator cuff. See rotator cuff for rotator cuff injuries The trunks reshuffle as they traverse towards the arm into cords. There are three of them. The lateral cord is made up of fibers from the anterior and middle trunk. The posterior cord is made up of fibers from all three trunks. The medial cord is composed of fibers solely from the medial trunk.

The lateral cord gives rise to the following nerves:

The lateral pectoral nerve, C5, C6 and C7 to the pectoralis major muscle
The musculocutaneous nerve which innervates the biceps muscle
The median nerve, partly. The other part comes from the medial cord. See below for details.

The posterior cord gives rise to the following nerves:

The upper subscapular nerve, C7 and C8, to the subscapularis muscle of the rotator cuff.
The lower subscapular nerve, C5 and C6, to the teres major also of the rotator cuff.
The thoracodorsal nerve, C6, C7 and C8, to the latissimus dorsi muscle.
The axillary nerve, which supplies sensation to the shoulder and motor to the deltoid muscle and the teres minor muscle.
The radial nerve, which innervates the triceps brachii muscle, the brachioradialis muscle, the extensor muscles of the fingers and wrist(extensor carpi radialis muscle), and the externsor and abductor muscles of the thumb. See radial nerve injuries

The medial cord gives rise to the following nerves:

The median pectoral nerve, C8 and T1, to the pectoralis muscle
The medial brachial cutaneous nerve, T1
The medial antebrachial cutaneous nerve, C8 and T1
The median nerve, partly. The other part comes from the lateral cord. C7, C8 and T1 nerve roots. The first branch of the median nerve is to the pronator teres muscle, then the flexor carpi radialis, the palmaris longus and the flexor digitorum superficialis. The median nerve provides sensation to the anterior palm, the anterior thumb, index finger and middle finger. It is the nerve compressed in carpel tunnel syndrome.
The ulnar nerve originates in nerve roots C7, C8 and T1. It provides sensation to the ring and pinky fingers. It innervates the flexor carpi ulnaris muscle, the flexor digitorum profundi muscle to the ring and pinky fingers, and the intrinsic muscles of the hand (the interosseous muscle, the lumbrical muscles and the flexor pollicus brevis muscle. This nerve traverses a groove on the elbow called the cubital tunnel, also known as the funny bone. Striking the nerve at this point produces an unpleasant sensation in the ring and pinky fingers.

The remainder of the thoracic spinal nerves, T3 through T12, do little recombining. They form the intercostal nerves, so named because the run between the [rib]s. For points of reference, the 7th intercostal nerve terminates at the lower end of the sternum, also known as the xyphoid. The 10th intercostal nerve terminates at the umbilicus, aka the belly button.

Lumbar spinal nerves
Sacral spinal nerves
Coccygeal spinal nerves

Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Peripheral nervous system."

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Synonym: Peripheral Nervous System

Synonym: systema nervosum periphericum (n). (additional references)

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Crosswords: Peripheral Nervous System

English words defined with "peripheral nervous system": neurosurgery ♦ Schwann cell. (references)

Specialty definitions using "peripheral nervous system": 2-Chloroadenosine ♦ Autoimmune Diseases of the Nervous System ♦ Baroreflex, Bladder, Neurogenic ♦ Carbidopa, Carbohydrate-Deficient Glycoprotein Syndrome ♦ Demyelinating Diseases, Diagnostic Techniques, Neurological ♦ Ganglia, Sensory ♦ Heavy Metal Poisoning, Nervous System ♦ lead palsy, lead paralysis, Lead Poisoning, Nervous System ♦ Methoxamine, Muscarinic Antagonists, Muscular Disorders, Atrophic, Myelin Proteins ♦ Nerve Endings, Nerve Sheath Tumors, Nervous System Diseases, Nervous System Malformations, Nervous System Neoplasms, Nervous System Physiology, Neurodegenerative Diseases, neuroectodermal tumor, neurofibroma-1 gene, Neuroimmunomodulation, Neurotensin, NF-1 gene, Nicotinic Agonists ♦ Peptide PHI, Peripheral Nervous System Agents, Peripheral Nervous System Diseases, Progressive Bulbar Palsy, Pseudobulbar Palsy ♦ Receptors, Histamine, Receptors, Neurokinin-3, Receptors, Purinergic P2 ♦ Schwann Cells, schwannoma, Sensation Disorders ♦ Tibial Neuropathy, toxic dust. (references)

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Commercial Usage: Peripheral Nervous System

Domain	Title
Books	Adrenergic Neurons: Their Organization, Function, and Development in the Peripheral Nervous System (reference) Endoscopy of the Central and Peripheral Nervous System (reference) The Peripheral Nervous System. (reference) Transferrin, Ferritin and Iron in the Central and Peripheral Nervous System (reference) Ultrastructure of the peripheral nervous system and sense organs; atlas of normal and pathological anatomy (reference) (more book examples)

Periodicals	Journal Of The Peripheral Nervous System (reference) (more periodical examples)
Source: compiled by the editor from various references; see credits.

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Non-Fiction Usage: Peripheral Nervous System

Subject	Topic	Quote
Health		The peripheral nervous system also includes 12 pairs of cranial nerves located on the underside of the brain. (references)
		The NINDS supports a broad program of research on disorders of the peripheral nervous system, including peripheral neuropathy. (references)
		Guillain-Barrè (ghee-yan bah-ray) syndrome is a disorder in which the body's immune system attacks part of the peripheral nervous system. (references)
Source: compiled by the editor from ICON Group International, Inc.; see credits.

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Expressions: Peripheral Nervous System

Expressions using "peripheral nervous system": Peripheral Nervous System Agents ♦ Peripheral Nervous System Diseases ♦ Peripheral Nervous System Neoplasms. Additional references.
Source: compiled by the editor from various references; see credits.

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Frequency of Internet Keywords: Peripheral Nervous System

The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com.

Expression	Frequency per Day
peripheral nervous system	54
peripheral nervous system disease	3
Source: compiled by the editor from various references; see credits.

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Modern Translations: Peripheral Nervous System

Language		Translations for "peripheral nervous system"; alternative meanings/domain in parentheses.
Danish		perifere nervesystem (being branched from the central nervous system into all parts of the organism, the part of the nervous system composed of nerves and ganglia). (various references)

Dutch		perifeer zenuwstelsel (being branched from the central nervous system into all parts of the organism, the part of the nervous system composed of nerves and ganglia). (various references)

Finnish		perifeerinen hermosto (being branched from the central nervous system into all parts of the organism, the part of the nervous system composed of nerves and ganglia), ääreishermosto (being branched from the central nervous system into all parts of the organism, the part of the nervous system composed of nerves and ganglia). (various references)

French		système nerveux périphérique. (various references)

German		peripheres Nervensystem (being branched from the central nervous system into all parts of the organism, the part of the nervous system composed of nerves and ganglia). (various references)

Greek		περιφερικό νευρικό σύστημα (being branched from the central nervous system into all parts of the organism, the part of the nervous system composed of nerves and ganglia). (various references)

Italian		sistema nervoso periferico (being branched from the central nervous system into all parts of the organism, the part of the nervous system composed of nerves and ganglia). (various references)

Pig Latin		eripheralpay ervousnay ystemsay

Portuguese		sistema nervoso periférico (being branched from the central nervous system into all parts of the organism, the part of the nervous system composed of nerves and ganglia). (various references)

Spanish		polineuritis (being branched from the central nervous system into all parts of the organism, the part of the nervous system composed of nerves and ganglia). (various references)

Swedish		perifera nervsystemet (being branched from the central nervous system into all parts of the organism, the part of the nervous system composed of nerves and ganglia). (various references)
Source: compiled by the editor from various translation references.