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 cellular structure to which mrna molecules bind, What is the ce...

What is the cellular structure to which mRNA molecules bind to start the protein synthesis? To make proteins mRNA molecules of necessity associate to ribosomes. Ribosomes have

Explain the flow phase of stress response, Explain the Flow Phase of Stress...

Explain the Flow Phase of Stress Response? This is a neuro-endocrine response to physiological stress following the ebb phase. This phase is characterized by: Normal or

Responses of plants to stress-physiology, Responses Of Plants To Stress ...

Responses Of Plants To Stress The internal chemical signals and environmental factors - the external signals which are perceived by special molecules present in the cell. In t

Define the post-herbal period, Define the Post-Herbal Period? It is di...

Define the Post-Herbal Period? It is difficult to draw a sharp line of demarcation between the transition period, marked by various attempts of classification, all of which we

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

Explain the biography of pedanius dioscorides, Explain the Biography of Ped...

Explain the Biography of Pedanius Dioscorides? Pedanius Dioscorides, a Cicilian Greek, who lived in the first century A.D. was the most important botanist after Theophrastus. H

Explain the acquired deficiency of the vitamin k metabolism, Why are some t...

Why are some types of hemorrhagic diseases caused by genetic or acquired deficiency of the vitamin K metabolism? Lack of vitamin K predisposes to hemorrhages as this vitamin i

Cardiac cycle, The term cardiac cycle means one pumping cycle which consist...

The term cardiac cycle means one pumping cycle which consists of contraction (systole) and relaxation (diastole) of both the atria and both ventricles. Both the atria contract at t

Vitamin - a, VITAMIN - A Discovered by Macollum. Also known as ...

VITAMIN - A Discovered by Macollum. Also known as Retinol / Antixeropthalmic vitamin / Auxerophthol. It is vitamin for normal vision. It forms retinal pigments rho

Define cooking, Define cooking,blanching and Canning - thermal processing? ...

Define cooking,blanching and Canning - thermal processing? Cooking: Cooking is a primary process to make food more palatable and improve taste. This is not used as a preservati

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages