Explain the spinal nerves, Science

Assignment Help:

Explain the Spinal Nerves

As mentioned earlier, there are 31 pairs of spinal nerves that leave the vertebral canal by passing through the intervertebral foramina formed by adjacent vertebrae. All of the spinal nerves are "mixed", that is, they contain both sensory and motor neurons. A representation of these spinal nerves supplying to the specific organs, you may recall has already been presented, in Figure. Look up Figure now. You will realize that these spinal nerves are named and grouped according to vertebrae to which they are associated.

8 - Cervical, 12 - Thoracic, 5 - Lumbal, 5 - Sacral, 1 - Coccygeal

1146_Explain the Spinal Nerves.jpg

Although there are only 7 cervical vertebrae, there are eight nerves because the first pair leaves the vertebral canal between the occipital bone and the atlas and eighth pair leaves below last cervical vertebrae. Lumbar, sacral, coccygeal nerves leave spinal cord near its termination at the level of first lumbar vertebrae. They extend down inside the vertebral canal in the subarachnoid space, which forms a sheaf of nerves, which resembles a horse's tail - the cauda equina. They leave the vertebral canal at the appropriate lumbar, sacral or coccygeal level. There are 12 pairs of thoracic nerve. Eleven of them are situated between the ribs, and are therefore termed intercostal; the twelfth lies below the last rib. They pass in-between the ribs supplying the intercostal muscles and overlying skin. The 12th pairs are the sub costal nerves. The 7th to 12th thoracic nerves also supply muscles of the skin of posterior and anterior abdominal walls. The spinal nerve arises from both sides of spinal cord and emerges through intervertebral foramina. Each nerve is formed by the union of a motor and sensory nerve root and thus forms a mixed nerve, as mentioned above. Each spinal nerve has contributions from sympathetic part of autonomic nervous system in the form of a preganglionic fibre.


Related Discussions:- Explain the spinal nerves

Explain nasal secretions and cerumen, Explain Nasal secretions and Cerumen ...

Explain Nasal secretions and Cerumen Nasal secretions: These can destroy harmful organisms due to lysosomal activities. Cerumen (wax of ear): It traps and kills the bacteria

How cells join together, In a unicellular organism, the interior  region of...

In a unicellular organism, the interior  region of  the organism  is no longer in contact with the external environment.  Thus simple processes  of  diffusion, phagocytosis, exocyt

What is the earth crust made of, What is the earth crust made of? Ans) ...

What is the earth crust made of? Ans) The overall composition of the Earth crust is as follows: Silicon 27.7% Oxygen 46.6% Iron 5.0% Aluminum 8.1% All other elem

Properties of waves, how amplitude , wavelength , and frequency are relate...

how amplitude , wavelength , and frequency are related to the energy of a wave

Solar system, about solar system how does it works

about solar system how does it works

Water extinguishers, Water extinguishers :  Direct the jet at the base of ...

Water extinguishers :  Direct the jet at the base of the flame and keep it moving across the fire. Attack a fire which is spreading vertically at its lowest point and follow th

Explain antibodies, Explain Antibodies Antibodies (also referred to as ...

Explain Antibodies Antibodies (also referred to as immunoglobulins and garnmaglobulins) are produced by plasma cells. They are Y-shaped proteins that each respond to a specific

Colorectal cancer, This paper employs the writings of Heidegger, not only t...

This paper employs the writings of Heidegger, not only to provide a research methodology, but also a philosophical framework that guides a way of understanding being with gastroint

Science and technology during the renaissance, Science and Technology durin...

Science and Technology during the Renaissance:  This phase in the history of science was one of description and criticism. First came the exploration of ancient knowledge, mainly o

Archaeological evidence, Archaeological Evidence: The study of human ...

Archaeological Evidence: The study of human antiquities, especially of prehistoric period is known as archaeology. The biological and cultural evolution of man proceeded side

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd