(redirected from nerve endings)
Also found in: Dictionary, Thesaurus, Medical, Legal.
Related to nerve endings: nerve ending pain


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.
..... Click the link for more information.



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.



A bundle of nerve fibers or processes held together by connective tissue.


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.


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 ?
Pulsed delivery of injections is potentially less painful than injecting an anesthetic in a continuous fashion as it allows the nerve endings to accommodate for distortion.
However, because the hydrogel expands in water and fluids, the expansion would collapse the tunnel and reduce the ability of the nerve endings to regenerate and connect, Abidian said.
In case, the gap happens to be close to a joint, a flexion in this joint can lead to both nerve endings approaching each other, anatomically making a primary suture without tension possible.
1987, 1989) studied the sensory nerve endings of Cebus apella tongue utilizing the silver impregnation method and found the subepitelial single and complex sensory nerve endings.
The two operations, scheduled to take place in February, involve targeting the nerve endings throughout Jessica's face with a high resolution laser.
He sent us to see a specialist at Birmingham Children's Hospital who told us Jack had MLD, which basically means he doesn't have the enzyme needed to break down the fatty deposits on the brain's nerve endings.
Researchers identified over 106 tubules (usually associated with pain reception in teeth) and ten million nerve endings in the tusk, indicating the tusk's ability to behave like a membrane with an extremely sensitive surface.
Those given cochlear implants within 5 months developed robust nerve endings at the synapses where the auditory nerve provides signals to the brain, say David K.
Richard Rappaport's study of the discovery of the nerve synapse Nerve Endings (0393060195, $23.
This operation, to shave the nerve endings in his wrist, will hopefully enable the 59-times capped scrum-half to take up that opportunity at the Arms Park.
Akin to a stroke, the bends are particularly brutal on nerve endings, which can only survive a short time without air.
The Guisborough racer admitted he couldn't even feel his hands by the end of the second race at Croft on Sunday and was experiencing electric shocks caused by his nerve endings being affected.