Nervous system - spinal nerves, Biology

Assignment Help:

SPINAL NERVES

  • 31 Pairs. Mixed type. Total weight 150 gms.
  • At the base of origin of spinal nerves gland of swammardon or calcarious ganglion is present.
  • Composed of medulated nerve fibres.
  • Classified into five groups -

1. Cervical                          - 8 pairs

 

2. Thoracic                         - 12 pairs

 

3. Lumber                           - 5 pairs

 

4. Sacral                            - 5 pairs

 

5. Coccygeal                      - 1 pair

  • Each spinal nerve is originated from spinal cord from dorsal root and ventral root.
  • In dorsal root, root ganglion is present. Both roots fuse in neural canal to form spinal nerve.
  • It comes out of vertebral column from inter vertebral foramen.
  • Out side vertebral column each spinal nerve is divided into three parts - 

                    (i) Dorsal branch or Ramus dorsalis

                    (ii) Ventral branch or Ramus ventralis

                    (iii) Visceral branch or Ramus communicans

  • Dorsal branch to skin and muscle of dorsal side.
  • Ventral branch to skin & muslce of ventral side.
  • Visceral branch is attached to ganglions of A.N.S.
  • In rabbit 37 pairs spinal nerves present -

1. Cervical                          - 8 pairs

2. Thoracic                         - 12 pairs

3. Lumber                           - 7 pairs

4. Sacral                            - 4 pairs

5. Caudal                           - 6 pairs

In rabbit caudal nerves combine with filum terminalis to form cauda equina.


Related Discussions:- Nervous system - spinal nerves

Explain angio-edema, Explain Angio-edema Angio-edema:  Swelling of the ...

Explain Angio-edema Angio-edema:  Swelling of the mucous membranes, tissues beneath the skin or an internal organ because of an allergic reaction.

What is cellulose, What is cellulose? Cellulose is a long-chain polymer...

What is cellulose? Cellulose is a long-chain polymeric polysaccharide carbohydrate, of beta-glucose. It creates the primary structural component of green plants. The primary ce

1, #phyletic lineage ..

#phyletic lineage ..

Define the term behaviour change communication, Q. Define the term Behaviou...

Q. Define the term Behaviour Change Communication? Behaviour Change Communication (BCC) is an interactive process with communities to develop specific messages and methods usin

Define the food sources of thiamin, Define the Food Sources of Thiamin? ...

Define the Food Sources of Thiamin? Thiamin is present in many food products and depending on the amount of vitamin present, we have categorized the foods as rich, good or fair

Research to improve health care delivery, Research to Improve Health Care D...

Research to Improve Health Care Delivery: Today, much  of health  care  delivery  system remains  imitative  and intuitive rather than innovative,  creative or  scientific in

Most important allosteric effector of glycolysis in liver, Name the most im...

Name the most important allosteric effector of glycolysis in the liver. Fructose-2,6-bisphosphate  is the most important allosteric effector of glycolysis  in the liver

Sastry, he heartbeat begins with the depolarization of the

he heartbeat begins with the depolarization of the

Extraradicular infections, Extraradicular Infections Whatever the cause...

Extraradicular Infections Whatever the cause of post endodontic disease we should do proper diagnosis to determine what is the cause; is it intra or extraradicular infection ,

Express how that system accomplishes that necessity, Name a system that acc...

Name a system that accomplishes that necessity and explain how that system accomplishes that necessity.

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