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

Safety aspects of feed processing, Safety aspects of feed processing S...

Safety aspects of feed processing Safety of the man and machine in a feed mill is very important to avoid the accidents. Some basic aspects of a good safety programme are as f

Chlamydiosis-clinical manifestations, Clinical manifestations Since the...

Clinical manifestations Since the disease due to Chlamydia involves many organs/systems, system-wise descriptions of clinical signs is described as under: Genital infectio

Biology of Plants Assignment, I have a six page assignment, which involves ...

I have a six page assignment, which involves barely any writing, just labeling some plant structures etc. Can someone do this?

What are hexoses, What are hexoses? What are some examples of hexoses with ...

What are hexoses? What are some examples of hexoses with important biological functions? Hexoses are carbohydrates made of six carbons. Glucose, fructose and galactose are inst

Explain about metabolic diseases, Q. Explain about Metabolic diseases? ...

Q. Explain about Metabolic diseases? Metabolic diseases, as you already know, refer to those disorders in which the various reactions in the cells are effected (production of e

Skin and cornea grafting, SKI N GRAFTING - Skin for grafting is taken ...

SKI N GRAFTING - Skin for grafting is taken from another part of body of the same persons. Now it is possible to grow a sheet of skin in culture from a small piece of skin

What is the general cognitive ability, What is the General Cognitive Abilit...

What is the General Cognitive Ability General cognitive ability is usually assessed using standardised intelligence tests, such as Wechsler Intelligence Scale for Children Thir

What is the difference between octopuses and mussels, What is the differenc...

What is the difference between octopuses and mussels regarding their circulatory systems? How does that difference influence the mobility of these animals? Cephalopod molluscs,

Respiratory system of the phylum annelida characterized, Q. How is the resp...

Q. How is the respiratory system of beings of the phylum Annelida characterized? Respiration in annelids can be branchial or cutaneous. Cutaneous respiration takes place due to

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