nerve

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nerve:

see nervous systemnervous system,
network of specialized tissue that controls actions and reactions of the body and its adjustment to the environment. Virtually all members of the animal kingdom have at least a rudimentary nervous system.
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Nerve

 

the cordlike association of nerve tissues that links the brain and nerve ganglia by innervation to the other organs and tissues of the body.

A nerve primarily consists of nerve fibers. In vertebrates many nerves converge to form a bundle that is surrounded by a connective tissue sheath, the perineurium; the thin interstitial layers of connective tissue that separate the individual fibers deep within the bundle constitute the endoneurium. Finally, the entire nerve trunk, comprising several bundles, is covered by an additional sheath, the epineurium.

Nerves can be sensory (also called afferent or centripetal) or motor (also called efferent or centrifugal). Some nerves, for example, those innervating the skeletal muscles, mainly include myelinated, or medullated, fibers; others, for example, the sympathetic nerves, largely consist of unmyelinated, or unmedullated, fibers.

In reptiles, birds, mammals, and man 12 pairs of cranial nerves branch from the brain: the olfactory (cranial nerve I), the optic (cranial nerve II), the oculomotor (cranial nerve III), the trochlear (cranial nerve IV), the trigeminal (cranial nerve V), the abducent (cranial nerve VI), the facial (cranial nerve VII), the acoustic (cranial nerve VIII), the glossopharyngeal (cranial nerve IX), the vagus (cranial nerve X), the accessory (cranial nerve XI), and the hypoglossal (cranial nerve XII). Only the first ten pairs are present in fish and amphibians.

In man there are 31 pairs of spinal nerves: eight cervical, 12 thoracic, five lumbar, five sacral, and one coccygeal. Each pair innervates the effectors and receptors of a certain part of the body. The spinal nerves branch from the spinal cord into two roots—the posterior, or sensory, and the anterior, or motor. Both roots then combine to form a common trunk that consists of both sensory and motor fibers.

Several adjacent nerves can be combined into nerve plexuses, where an exchange of fibers between different nerves can take place. Three large plexuses are distinguished: the cervical, the brachial, and the lumbosacral. Each nerve plexus is the origin of several pairs of nerves; for example, the sacral portion of the lumbosacral plexus gives rise to the sciatic nerves.

Nerves that originate in the ganglia, trunks, and plexuses of the autonomic nervous system constitute a specific group. The optic nerve is remarkable for its large number of fibers; there are more than 1 million in the human optic nerve. Usually, however, there are 103 -104 fibers in a nerve. In invertebrates certain nerves are known to consist of only a few fibers. The peripheral nervous system in animals and man consists of aggregations of nerves.

D. A. SAKHAROV

nerve

[nərv]
(neuroscience)
A bundle of nerve fibers or processes held together by connective tissue.

nervure

Any one of the ribs of a groined vault, but esp. a rib which forms one of the sides of a compartment of the groining.

nerve

1. any of the cordlike bundles of fibres that conduct sensory or motor impulses between the brain or spinal cord and another part of the body
2. a large vein in a leaf
3. any of the veins of an insect's wing
References in periodicals archive ?
This technique subverts the need for the usual multiple injection techniques employed for blocking the major nerves of the lower limb, namely femoral nerve, obturator nerve, sciatic nerve and several other cutaneous nerves. Moreover, in this technique patient can remain supine, adding comfort to the patient during the procedure, unlike other techniques involving other patient positions.
It may also help to explain the limited therapeutic value of the use of topical applications in NP (55) in that the cutaneous nerves may only play a partial role.
The anatomy of the lateral femoral cutaneous nerve, with special reference to the harvesting of iliac bone graft.
The RPSC contains the femoral and lateral femoral cutaneous nerves, as theyemerge from the posterolateral border of the psoas major muscle caudal to the level of the iliac crest.
Cooling the surface numbs the cutaneous nerve endings, thus minimizing pain.
However, in that number Baczkowski included minor injuries to fine digital cutaneous nerves, which increased the total number of surgical procedures.
Aizawa reported that the medial cutaneous nerve branch and the adductor longus branches were the first two branches to leave the femoral nerve in the thigh.
In addition, we identified an important number of mast cells organised near cutaneous nerve structures or blood vessels (Figures 2(a) and 2(b)).
In another study, injury to the median palmar cutaneous nerve in 10%, injury to the radial artery in 5% and wrist stiffness in 12.5% of the patients are declared.11 In a similar study parallel results were obtained.12 Gumus et al.
In sensitized mice, ESGM increased the activity of cutaneous nerve, which was suppressed by G.
The most common, and most likely explanation for your history, is lateral femoral cutaneous neuropathy, or what is referred to as "meralgia paresthetica." The lateral femoral cutaneous nerve is formed in the mid-pelvic from several upper branches of nerve roots in the lower back, specifically from the L2, L3, and L4 nerve roots.

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