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

The klove roughness discrimination test, The Klove roughness Discrimination...

The Klove roughness Discrimination Test The subject must order four blocks covered with varying grades of sandpaper presented behind a blind with regards to degree of roughness

Is NADH oxidized by the electron transport chain, The oxidation of glucose...

The oxidation of glucose produces NADH that is oxidized by the electron transport chain. What compound is the terminal electron acceptor of the electrons carried by NADH? -O2

Explain precautions for gram staining of bacterial cultures, Explain Precau...

Explain Precautions for Gram Staining of Bacterial Cultures? 1. Heat fix the smear, otherwise cells would be washed off. 2. Fresh 24 hrs old culture should be used. Gram var

Explain what position of patient will during jvp examination, Explain what ...

Explain what Position of Patient will be During JVP Examination ? Position of Patient During JVP Examination: The patient is propped up to 45"on a back rest or pillow as in thi

Explain tools of satellite dna, Satellite DNA is useful tool in: 1. Org...

Satellite DNA is useful tool in: 1. Organ transplantation 2. Sex determination 3. Forensic science 4. Genetic engineering Forensic science

Bacteria is an obligate anaerobe, Q. What is signifying when it is said tha...

Q. What is signifying when it is said that a bacteria is an obligate anaerobe? Obligate anaerobes are those living beings that do not survive in the presence of oxygen. For exa

Light and dark reactions, Evidence for Existence of Light and Dark Reaction...

Evidence for Existence of Light and Dark Reactions The process of photosynthesis was known in its bare outline already at the beginning of this century. But the phenomenon wa

What are the uses of squid fins, What are the uses of squid fins? Fins ...

What are the uses of squid fins? Fins are used by squids to move at low speeds. Their siphon is used when they require moving quickly.

Methods and Vectors, Match each of the methods or vectors below to an appro...

Match each of the methods or vectors below to an appropriate form of gene therapy, assigning two methods or vectors to each form. Use each method or vector only once. Methods/vec

BLOOD CELLS, What is the function of platelets?

What is the function of platelets?

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