Peripheral Nervous System

Q. Myelin sheath in central nervous system (CNS) is formed from

1. Schwann cells
2. nerve cell itself
3. astrocytes
4. oligodendrocytes

Q. Myelin sheath is produced by oligodendrocytes in CNS and Schwann cells in PNS. But unmylinated neurons are present in ANS and SNS...how are they unmylinated if oligodendrocytes produce them??

Q. Distinguish between :
Cranial nerves and spinal nerves.

Q. The synaptic, cleft an intercellular gap separating the axon tip and the target neuron, is____

1. $1-10$ millimeter
2. $10-20$ micrometer
3. $10-20$ nanometer
4. $1$ decimeter

Q. If you pick up a hot plate _____________ receptors in your ___________ detect this change

1. motor, skin
2. sensory, muscle
3. sensory, skin
4. intermediate, muscle

Q. There are pairs of cranial nerves and pairs of spinal nerves in humans.

Q. Give technical term for the nerve, which transmits impulses from the ear to the brain.

Q. Myelin of the nerve fibres of the central nervous system is produced and maintained by

1. Astrocytes
2. Oligodendrocytes
3. Microglia
4. Schwann cells

Q. Which of the following cranial nerve does not carry autonomous fibres?

1. III
2. X
3. VII
4. V

Q. produces myelin sheath in the peripheral nervous system.

1. Oligodendrocytes
2. Astrocytes
3. Schwann cells
4. Microglia

Q. Read the given statements and choose the correct option.

1. Astrocytes are mesodermally derived macroglial cells that form the blood brain barrier.
2. Epineurium forms white firbrous protective sheath around a single fasiculus in a nerve
3. Neuroglial cells constitute more than one half of volume of neutral tissue
4. Presence of centrosome in neurons in responsible for their to divide, regenerate and repair.

Q. Alcohol

1. Increases reaction time
2. Does not affect reaction but diminished decision making
3. Decreases reaction time
4. Both B and C