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 is the fuction of starch, What is the fuction of Starch Starch is ...

What is the fuction of Starch Starch is the main thickener in gravies, sauces and puddings. Starch absorbs water, and  becomes a gel when cooked. As the starch swells up with w

Main manifestations of cholera, Q. What is the etiological agent and the ma...

Q. What is the etiological agent and the main manifestations of cholera? The Cholera is a bacterial disease caused by the Vibrio cholerae. The disease is spread by fecal-oral r

What are proteins, What are proteins? How can the protein diversity of livi...

What are proteins? How can the protein diversity of living beings be explained? Proteins are molecules made of sequences of amino acids bound by a peptide bond. The genetic

What was necessary to develop regulations, Why it was necessary to develop ...

Why it was necessary to develop regulations on the preparation and sale?

Personnel - neonatal care unit, PERSONNEL It is important that while a...

PERSONNEL It is important that while allocating nursing, medical and paramedical staffs, the needs of the neonatal unit should not be ignored. The highest priority in the orga

Vitamin, fish liver oil is rich in which vitamin ???

fish liver oil is rich in which vitamin ???

Coadapted communities, From your studies in ecology, you must be aware that...

From your studies in ecology, you must be aware that most ecosystems are quite complex consisting of several habitats and that habitats in turn are composed of microhabitats. Each

Alleles and possible causative candidate alleles, Genome wide association s...

Genome wide association studies must account for the fact that covering the entire genome with marker loci will produce ______ associations between linked marker alleles and possib

Why is it true that of the 28 chromosomes in an ovum, A species has a diplo...

A species has a diploid chromosome number of 56, WHY is it true that of the 28 chromosomes in an ovum, 14 are always paternal?

Treatment and management of diarrhoea, Q. Treatment and Management of Diarr...

Q. Treatment and Management of Diarrhoea? You must have realized by now that diarrhoea should not be neglected and must receive prompt medical care to minimize the frequency of

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