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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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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 ?
The medial plantar branch of the tibial nerve, the median nerve, and the superficial radial nerve all demonstrated significant sensory improvement (P = 0.
Following dissection of the tibial nerve trunk and its branches under surgical microscope, the different motor collaterals of the soleus and gastrocnemeii nerves and the posterior tibial nerve were identified.
The absence of sensitivity to the sole of foot was confirmed later when the tibial nerve (N) was found severed.
Sensory conduction studies of right or if not available left median ul- nar and sural nerves and motor conduction studies of median ulnar peroneal and tibial nerves were obtained by standard procedures.
Washington, May 31 ( ANI ): Tibial nerve stimulation helps ease symptoms of overactive bladder, or OAB, a new study has suggested.
In addition, the common fibular and sural nerve had been entirely separated and the tibial nerve as well as the popliteal vein and artery had been severely damaged.
A term of "tarsal tunnel syndrome" describes a condition in which the trunk or branches of the tibial nerve are compressed within the course of the flexor retinaculum around the medial malleolus [4-9].
Peroneal nerve motor and sensory conductions, tibial nerve motor conduction and sural nerve sensory conduction were also examined.
Axonotmesis, a peripheral nerve injury occurred to the superficial fibular nerve causing sensory disruption in the dorsum of the foot and digits and to the tibial nerve causing sensory disruption one inch inferior to the medial malleolus.
max] onset latency) evoked by electrical stimulation of the posterior tibial nerve.