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

Species and habitats, Can you give me an example of the species that crosse...

Can you give me an example of the species that crossed a few habitats?

What are gene chips, Question  Write a short note on the following 1 St...

Question  Write a short note on the following 1 Stem cells 2 Edible vaccines 3 Biologic Materials 4 Liposomes 5 What are gene chips? Explain any 4 applications of g

Explain micropener - non-surgical endodontic retreatment, Explain Micropene...

Explain Micropener - Non-surgical Endodontic Retreatment        They are iso-colour coded flexible, StSt hand instruments It has with 7mm k-type flutes, It is ava

Explain the treatment of iron deficiency anaemia, Explain the Treatment of ...

Explain the Treatment of iron deficiency anaemia? Oral iron is the preferred method of treatment of IDA. The dosage is decided depending on the severity of the condition. Gener

How does the contraceptive diaphragm work, How does the contraceptive diaph...

How does the contraceptive diaphragm work? What are the limitations of this contraceptive method? The contraceptive diaphragm is an artifact made of latex or plastic that when

Strobilation - types of asexual reproduction, Strobilation - Types of Asexu...

Strobilation - Types of Asexual Reproduction Strobilation is a type of asexual reproduction in which successive segments are separated off from the body one after other. It is

Bacterial flagella structure and protocol, #qprokroyotic flagella struct...

#qprokroyotic flagella structure and protocoluestion..

Ripening bananas, you tested three different treatments for ripening banana...

you tested three different treatments for ripening bananas. Before you did the lab, which one did you think would have ripened most? State your hypothesis and explain your reason

Sucession, what is the model of tolerence mpdel of sucession

what is the model of tolerence mpdel of sucession

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