Advertisements
Advertisements
Question
Give one point of difference between the following on the basis of what is indicated:
Cerebrum and spinal cord. (Arrangement of neurons)
Advertisements
Solution 1
The arrangement of neurons in
Cerebrum: cytons are present outside and axons are inside
Spinal cord: cytons are present inside and axons are outside.
Solution 2
| Cerebrum | Spinal cord |
| The inner portion of the cerebrum consists of white matter, mainly containing the axons (nerve fibers) of the neurons. | The inner portion of the spinal cord consists of gray matter containing the cell bodies, motor, and associated neurons whereas the white matter forms the outer layer. |
RELATED QUESTIONS
Describe T.S. of the spinal cord.
Give Technical Term:
The brain and spinal cord together constitute the system known as.
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?
Complete the following sentence with appropriate word :
The part of the central nervous system which responds to the reflex action is ________.
Identify the odd item from the following series of words.
There are ______ pairs of cranial nerves and ______ pairs of spinal nerves.
Spinal cord is enclosed in ____________ of vertebral column.
______ connects the brain to a different part of the body through nerves.
Given below is the transverse section of the spinal cord. Read the information below the diagram and fill in the blanks:

The spinal cord extends from the medulla oblongata of the brain and runs down through the whole length of the vertebral column. The spinal cord is covered by the meninges. It conducts impulses from the skin and muscles to the brain. It also conducts impulses from the brain to the muscles of the trunk and limbs.
The spinal cord is a part of the (a) ______ Nervous System. The grey matter in the picture given above consists of (b) ______ while the white matter consists of (c) ______. The spinal cord is concerned with the (d) ______ actions below the neck. (e) ______ is the bony structure that protects the spinal cord.
