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

What are the functions of the spleen, Q. What are the functions of the sple...

Q. What are the functions of the spleen? Why is a total splenectomy (surgical removal of the spleen) compatible with life? The spleen has many functions: it participates in the

Effects of smoking on oesophagitis, Q. Effects of smoking on oesophagitis? ...

Q. Effects of smoking on oesophagitis? 1. A decrease in pyloric sphincter pressure which may predispose an individual to duodenal ulcer. 2. An alteration in the nature of ga

What is the function of glucose-6-phosphatase, What is the function of gluc...

What is the function of glucose-6-phosphatase? a) catalyze removal of one phosphate group from glucose b) catalyze removal of six phosphate groups from glucose c) catalyze the remo

What is surgical therapy, Surgical Therapy The clinician may use a surg...

Surgical Therapy The clinician may use a surgical approach when non-surgical therapies are not indicated or are unsuccessful. The surgical techniques are modified from those

Phylum protozoa, distinguishing charecters and classification of protozoa u...

distinguishing charecters and classification of protozoa upto phyla

Define effect of protein deficiency during pregnancy period, Define effect ...

Define effect of Protein deficiency during pregnancy period? The effects of protein deficiency during pregnancy are difficult to separate from the effects of caloric deficit, s

Reproduction, The fusion of two individuals with each acting as a gamete is...

The fusion of two individuals with each acting as a gamete is known as

What is intracellular digestion, What is intracellular digestion? Intra...

What is intracellular digestion? Intracellular digestion, or cellular digestion, is the breaking in the interior of the cell of big molecules coming from outside or even from i

How water content influence the rs content, How Water content Influence the...

How Water content Influence the RS content? The yield of RS formed in heat-moisture treatment is closely related to water content, which may be an inherent component of food or

Shrub stage - xerarch, Shrub Stage - Xerarch Sufficient soil is formed...

Shrub Stage - Xerarch Sufficient soil is formed in the herbs stage, for supporting the woody plants or the shrubs. They migrate with the help of seeds or rhizomes from the adj

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