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

Define meat as a rich source of protein, Define Meat as a Rich Source of Pr...

Define Meat as a Rich Source of Protein? Skeletal or striated muscles are used for food purposes. Flesh of cattle, sheep and swine comprise most of the meat contents. Edible me

Explain about the deuteromycota - fungi, Explain about the Deuteromycota - ...

Explain about the Deuteromycota - Fungi? Deuteromycota - Deuteromycetes or fungi imperfecti reproduce by means of conidia. These have either lost the capacity for sexual reprod

Define phenolic acids and derivatives, Define Phenolic Acids and Derivative...

Define Phenolic Acids and Derivatives? Two families of phenolic acids are widely distributed in plants: a range of benzoic acid derivatives and those derived from cinnamic acid

After purchasing - nursing software, After Purchasing The following po...

After Purchasing The following points should be considered for after purchase facilities. Avail of any training the software engineer or vendor may provide, even if it

Terrestrial biomes of the world, The primary factors that influence the for...

The primary factors that influence the formation of these biomes are climatic, like precipitation, temperature, seasonal extremes and winds. However, topography and light are also

Define signs and symptoms of iron deficiency anaemia, Define Signs and symp...

Define Signs and symptoms of iron deficiency anaemia? Since the level of haemoglobin is reduced in the blood, it causes paleness (pallor) on certain parts of the body. Initiall

Explain prophylaxis with antimicrobial, Explain Prophylaxis with antimicrob...

Explain Prophylaxis with antimicrobial Prophylaxis with antimicrobials has decreased the incidence of surgical site infection after head and neck operations that involve an inc

Functions of respiratory pigments, Functions of Respiratory Pigments A...

Functions of Respiratory Pigments As you have learnt in the preceding sub-sections, the pigments are the carrier of oxygen. In the nonexistence of respiratory pigments the blo

How much milk require by patient in a day, How many protein require patien...

How many protein require patient in a day Patients who require high protein diets are encouraged to drink 600-800 mL of milk a day. Now, you must be wondering how one can consu

Explain flucytosine, Explain Flucytosine Flucytosine (Ancobon) - Potent...

Explain Flucytosine Flucytosine (Ancobon) - Potentially lethal, dose-related bone mar- row toxicity, colitis and rapid development of resistance when used alone limit the use o

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