Advertisements
Advertisements
Question
Distinguish between Cranial nerves and spinal nerves.
Advertisements
Solution
| Cranial nerves | Spinal nerves | |
| 1. | Cranial nerves arise from the brain. | Spinal nerves arise from the spinal cord. |
| 2. | There are 12 pairs of cranial nerves. | There are 31 pairs of spinal nerves. |
| 3. | They are numbered I to XII in Roman numerals. | They are classified into five groups: cervical 8 pairs, thoracic 12 pairs, lumbar 5 pairs, sacral 5 pairs, and coccygeal 1 pair. |
| 4. | Cranial nerves are responsible for cerebral reflexes. | Spinal nerves are responsible for spinal reflexes. |
| 5. | These are of three types: sensory, motor, and mixture. | These are of three types: dorsal branch, the ventral branch, and the yogic nerve. |
APPEARS IN
RELATED QUESTIONS
Receptor, Spinal cord, Effector, Motor neuron, Sensory neuron.
Briefly explain the following terms: Synapse
Fill in the blank:
The neurons carrying impulses from the brain to the muscles are called _______________________.
Define the term Neuron.
Write the function of synapse.
Write the function of Association neuron.
Name the following:
The nerve which carry impulse from CNS to muscles.
Define the following:
Axon
Draw a labeled diagram of a myelinated neuron.
During synaptic transmission of nerve impulse, neurotransmitter (P) is released from synaptic vesicles by the action of ions (Q). Choose the correct P and Q.
Nerve cells do not possess ______
How nerve impulses are transferred from one neuron to the next neuron?
What are the gaps between adjacent myelin sheaths called?
Which nerves transmit impulses from the central nervous system towards muscle cells?
In a synapse, the chemical signal is transmitted from ______.
In a neuron, conversion of electrical signal to a chemical signal occurs at/in
Explain the function of the neuron.
Write one word for the following:
wave of electrical disturbance that sweeps over the nerve cell.
Give reason:
Neurotransmitters are broken down by an enzyme just after passing an impulse from one neuron to the other.
The figure given below is the basic structural and functional unit of the human nervous system. Study the diagram and answer the following questions:
![]() |
- Write the technical term for the diagram.
- Name two organs of our nervous system where these cells are richly found.
- How are these cells significant for us?
- Name the cell organelle that is absent in these cells and how does it affect our body metabolism?
- Redraw the same figure and label the following Perikaryon, Axon, Dendrites, Myelin sheath and Node of Ranvier.

