Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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
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.
greatest refraction of light is caused through
Functional unit of the nervous system-neuron: The human brain is composed of more than one hundred billion (100,000,000,000 or 1011) cells called 'neurons'. This number which
Competitive inhibition This type of inhibition takes place when a compound having a strong structural resemblance to the substrate competes with it for the catalytic site
INTRODUCTION : In the first unit of this block you read about hazards due to electricity and gases in the science laboratories. 'The second unit deals with yet another type of com
Explain Pus Formation Once a neutrophil finds a foreign particle or a bacterium, it will engulf it releasing enzymes, hydrogen peroxide and other chemicals from its granules to
Question 1: (a) Define the following under the Fisheries and Marine Act 2007 (i) Basket trap; (ii) Fish product; (iii) Canard net; (iv) Gear; (v) Fishing. (b) What shou
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
Describe the meaning of Continuous Cropping Continuous Cropping or Monoculture 1. The climate may favour one crop or a soil may be especially adapted to one crop. 2.
Use of Fire Extinguishers : We know that one type of fire extinguisher cannot serve the purpose on all kinds of fire. In this subsection you will study about the use of different
Autoclaved Heated in an instrument called as autoclave in which the boiling point of water can be elevated by increasing pressure more than atmospheric pressure.
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd