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प्रश्न
The diagram given below represents the spinal cord of a mammal, seen in a transverse section together with the nerves. Study the diagram and then answer the questions given below:
(i) Label the parts 1—8 indicated by guidelines.
(ii) What do the arrows indicate? What is the pathway indicated termed?
(iii) What type of nerve is shown in the diagram?
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उत्तर
(i)
- White matter
- Gray matter
- Dorsal root
- Ventral root
- Dorsal ganglion
- Sensory neuron
- Spinal nerve
- Synapse
(ii) The arrows indicate the arrangement of white and gray matter is reversed from that in the brain. The patl4way indicated is termed as a nerve pathway in a simple spinal reflex.
(iii) Sensory or Afferent nerve.
APPEARS IN
संबंधित प्रश्न
Differentiate between following pair with reference to the aspect in bracket.
cerebrum and spinal cord (arrangement of cytons and exons of neurons).
Distinguish between the following pair of words:
Motor and sensory nerve
Give the functions of the spinal cord?
Give Technical Term:
The fluid which fills the central canal of the spinal cord.
The diagram given below shows the internal structure of the spinal cord, depicting a simple reflex. Study the same and then answer the questions that follow:
(i) Name the parts numbered 1 to 5.
(ii) Using the letters of the alphabet shown in the figure indicate the direction in which an impulse enters and leaves the spinal cord.
(iii) What is the term given to the point of contact between two nerve cells?
(iv) What is meant by ‘simple reflex’ ? Give two examples of simple reflexes and name the stimuli too.
(v) How does the arrangement of nerve cells in the spinal cord differ from that in the brain?
Complete the following sentence with appropriate word :
The part of the central nervous system which responds to the reflex action is ________.
Sketch and label T. S. of Spinal cord.
Sensory nerve fibres forming ascending tracts in white matter of spinal cord are located in ____________.
Spinal nerves are usually ______
Explain the formation of a typical spinal nerve with the help of a neat labelled diagram.
