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प्रश्न
What are the nerves? Mention the types of nerves found in humans.
उत्तर
A bundle of nerve fibers joined together as a tubular sheath that transmits impulses between the brain or spinal cord and other body parts is called a nerve. The nerves constitute the peripheral nervous system.
Nerves are of two types in humans:
- Cranial nerves: They emerge from the brain. There are 12 pairs of cranial nerves.
- Spinal nerves: They emerge from the spinal cord. There are 31 pairs of spinal nerves.
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संबंधित प्रश्न
The organ A which is located inside the skull of our body is protected by a bony shell B. It is surrounded by three layers membranes C. The spaces between these layers are filled with a liquid D which protects organ A from mechanical shocks. Organ A in combination with another organ E makes up the central nervous system.
(a) What is organ A?
(b) What are B, C and D?
(c) Name the organ E.
(d) While walking barefoot, if we happen to step on a sharp piece of stone, we immediately lift our foot up. Which of the two organs: A or E, is directly involved in this action?
(e) If we step out from a darkened room into bright sunlight, we close our eyes for a moment. Which of the two organs: A or E, is directly involved in this action?
Fill in the blank:
The coloured part of eye is called _______.
Mention the three functions of the spinal cord.
Compare the nervous system and the endocrine system.
Distinguish between the following pair of words:
Adrenalin and acetylcholine
Complete the following sentence with appropriate word :
Optic nerve is a type Sensory nerve, whereas spinal nerves are __________ nerves
Very very short answer question.
What is the importance of Corpora quadrigemina?
Enlist the meninges of human brain.
The outermost layer of meninges:
What constitutes the central and peripheral nervous systems? How are the components of central nervous system protected?
