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 abo blood grouping system, Explain ABO Blood Grouping System A...

Explain ABO Blood Grouping System As the name suggest, this is based on the presence or absence of 9 antigens A and B, on the surface of RBC. If either of these antigens is pr

Prtozoa, advantages and disadvantages of protozoa

advantages and disadvantages of protozoa

Atrial natriuretic peptide and anti-diuretic hormone, Stroke A patient...

Stroke A patient has experienced a bleed in the left frontal lobe of their brain. Describe the changes that are likely to affect motor function after this bleed. Mobility, re

Describe about the moles, Describe about the Moles Molehills,  frequent...

Describe about the Moles Molehills,  frequently observed in some fields are composed of subsoil deposited by moles. They need a good reserve of calcium in soil.

Military technology used in golden era, Military Technology: Important ...

Military Technology: Important changes were introduced in military technology. Rope and wooden stimps  for horsemen were known in India before the thirteenth century. However,

Determine in brief about the soil texture, Determine in brief about the soi...

Determine in brief about the soil texture The texture is generally determined by the relative proportions of sand, silt and clay.  If various size fractions of the particles co

Month day, why there is 28 day in february month

why there is 28 day in february month

Hydrophobicity of amino acids, Hydrophobicity of Amino Acids Hydrophobi...

Hydrophobicity of Amino Acids Hydrophobicity of amino acids and also of peptides and proteins may be determined by  relative  solubility of amino acid  in water and in  a less

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