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प्रश्न
How are cytons and axons arranged in the spinal cord?
उत्तर
The spinal cord extends from the medulla of the brain down almost the whole length of the backbone to the end at the second lumbar vertebra and lies within the neural canal of the vertebrae.
The arrangement of white matter (axons) and grey matter (cytons) is the reverse of the brain.
Grey matter ( cytons) and association neurons lie on the inner side and white matter (axons) are present on the outer side.
APPEARS IN
संबंधित प्रश्न
Name the following:
Inability to speak.
Where is this located?
Meninges
Give one point of difference between the following on the basis of what is indicated:
Cerebrum and spinal cord. (Arrangement of neurons)
Fill in the blank with the function in the following:
Meninges: ______
Choose the correct answer.
Number of spinal nerves in human beings ______________
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?
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?
There are ______ pairs of cranial nerves and ______ pairs of spinal nerves.
Describe the structure of the spinal cord.
Explain the formation of a typical spinal nerve with the help of a neat labelled diagram.
