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 the goals of treatment of obesity, Define the Goals of treatment of ...

Define the Goals of treatment of Obesity? As said in the beginning, the goal of treatment of obesity today has shifted from mere 'weight loss' to 'weight management'. Each weig

Calculate the number molecules of glucose, During a routine annual physical...

During a routine annual physical, a patient was checked to determine the amount of glucose in the blood. After the assay, It was found that the glucose that the glucose concentrati

Ephemeral fever, Ephemeral fever It is also known as three days sicknes...

Ephemeral fever It is also known as three days sickness and affected animals suffer from pyrexia, muscular stiffness and lameness. Et i o l o g y :

Explain preoperative antibiotics, Preoperative antibiotics Preoperativ...

Preoperative antibiotics Preoperative antibiotics can decrease the incidence of infection after colorectal surgery; for elective operations, an oral regimen of neomycin (not a

Define the visual accommodation, Q. What is visual accommodation? Visua...

Q. What is visual accommodation? Visual accommodation is the phenomenon of varying the curvature of the crystalline lens to make possible the difference of its refractivity to

Right coronary artery, Right coronary artery arises from the anterior aorti...

Right coronary artery arises from the anterior aortic sinus. It runs down along the anterior part of the coronary sulcus, reaches the lower border of heart turns round the lower bo

Explain endoskeleton in detail, Explain Endoskeleton in detail. Support...

Explain Endoskeleton in detail. Supporting structures of the skeleton surrounded by the body tissues. As a consequence, there is living tissue on all sides of endoskeletal stru

What is human glucose transporters (glut), What is Human Glucose Transporte...

What is Human Glucose Transporters (GLUT)? All GLUTS are the integral proteins, which penetrate and span the lipid bilayer of plasma membrane. Six isomers of GLUT have been des

Is it necessary for blood to have less or more hemoglobin, Q. In high altit...

Q. In high altitudes is it necessary for the blood to have less or more hemoglobin? In high altitudes the oxygen concentration and air is rarefied is lower than in low altitude

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