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

Aprons for personal protective devices, Aprons : Additional protection, su...

Aprons : Additional protection, such as a rubber apron is recommended for work with appreciable amounts of chromic acid, hydrofluoric acid and other highly corrosive liquids.

What is classic technique of recipient operation, What is Classic Technique...

What is Classic Technique of Recipient Operation ? In this method, portions of left and light atria of both recipient and donor are retained. There is more atrial tissue of rec

Malnutrition and ill health, Malnutrition and ill health: Are you famil...

Malnutrition and ill health: Are you familiar with the term malnutrition? Malnutrition means either lack of sufficient food or imbalance of nutrients in the diet, resulting in

Counseling, If I send you ab assignment can you finish it by midnight centr...

If I send you ab assignment can you finish it by midnight central time TONIGHT

Amoeba, what is Amoeba shaped like

what is Amoeba shaped like

Explain the porphyrins in the urine, Explain the Porphyrins in the urine ...

Explain the Porphyrins in the urine Porphyrins (a group of compounds containing the porphin structure, four pyrrole rings connected by methine bridges in a cyclic configuration

Composition of bile - liver and bile stored in gall bladder, Composition of...

Composition of Bile - Liver and Bile Stored in the Gall Bladder There is a slight difference between the composition of bile produced by the liver and bile stored in the gall b

Big bang theory, Big Bang theory: The most important current theory f...

Big Bang theory: The most important current theory for the origin of  the universe  is the Big Bang theory.According  to this theory, the universe started with'a huge explosi

Explain immunoblotting (western blots), Explain Immunoblotting (Western blo...

Explain Immunoblotting (Western blots) In this technique, different Ag (which may be viral proteins) is separated by electrophoresis in a solid phase They are subjected to ele

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