Question

Read the given statements and choose the correct option.

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

Answer 1

The correct option is A Astrocytes are mesodermally derived macroglial cells that form the blood brain barrier.

• Astrocytes are the most common type of macroglial cells that are present in the central nervous system of the brain. They are responsible for the linkage of neurons to each other through their projection to regulate blood supply and plays a major role in the formation of the blood-brain barrier.
  
• Epineurium is the layer of connective tissue that surrounds the peripheral nerves while perineurium is the connective tissue which acts as the sheath surrounding the fasciculus of axons.
• Neuroglial cells are present in the neural tissues with neurons, they are much smaller than neurons and both neuroglial cells and neurons are present in the equal amount by occupying half volume of neural tissue.
• The centrosome is responsible for division and regeneration but these centrosomes are absent in the neurons due to which they are not dividing and cannot be regenerated if they die.

So, the correct option is 'Astrocytes are mesodermally derived macroglial cells that form the blood-brain barrier'.