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

Foam extinguishers, Foam extinguishers :  If the burning liquid is in a co...

Foam extinguishers :  If the burning liquid is in a container the jet should be directed at the inside edge of the vessel or at a vertical surface in order to break the jet and al

Environmental Geosciences and Restoraton Ecology, What is necessary to res...

What is necessary to restore the Marshall wetland in Margibi County, Liberia? The Marshall wetland has several features , including mangrove swamp, which is being degraded in some

Define the categories of autonomic nervous system, Define the Categories of...

Define the Categories of Autonomic Nervous System Autonomic nervous system is divided into 2 parts - sympathetic and parasympathetic. Sympathetic is a thoracolumbar outflow, para

A self-starting siphon, A self-starting siphon Secure a piece of glass ...

A self-starting siphon Secure a piece of glass or plastic tube about 2.5 cm in diameter and 8 to 10 cm in length. Fit single end with a one-hole stopper, carrying a short lengt

Kangaroo, i wants to know about kangaroo because my teacher give me an assi...

i wants to know about kangaroo because my teacher give me an assignment so for that i wants to know everything about kangaroo

Lithification of sediments, What types of rocks are formed by the lithifica...

What types of rocks are formed by the lithification of sediments: Sedimentary Rocks

Ray optics, find maximum angle for which the light suffers tir at vertical ...

find maximum angle for which the light suffers tir at vertical surface

Requirements chemicals for disposal of chemical wastes, REQUIREMENTS Chemic...

REQUIREMENTS Chemicals The following materials are common for the whole batch of students at the Study Centre, since this is a demonstration exercise. Acetone (or ethyl meth

Freezing by contact with a cooled solid-plate freezing, Freezing by Contact...

Freezing by Contact with a Cooled Solid-Plate Freezing In this method, the product is sandwiched between metal plates and pressure is usually applied for good contact.  Plate

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