Formation & Physiology

Question 1

What is the function of the meninges in the central nervous system?

Answer 1

• The meninges serve as a protective outer layer for both the brain and spinal cord.

Question 2

What anatomical structures do the meninges line?

Answer 2

• The meninges line the brain and the spinal cord.

Question 3

What is the outermost layer of the meninges called?

Answer 3

• The outermost layer of the meninges is called the Dura Mater.

Question 4

What does the Dura Mater directly contact with in the brain?

Answer 4

• In the brain, the Dura Mater directly contacts with the skull bones.

Question 5

Where is the direct contact of the Dura Mater in the spinal column?

Answer 5

• In the spinal column, the Dura Mater has direct contact with the vertebrae.

Question 6

What is the middle layer of the meninges called, and what is its structure like?

Answer 6

• The middle layer of the meninges is called the Arachnoid, and it has a web-like structure.

Question 7

What is the space between the Arachnoid and the Pia Mater called, and what flows through it?

Answer 7

• Subarachnoid space, and it is where cerebrospinal fluid (CSF) flows.

Question 8

What is the innermost layer of the meninges and where does it have direct contact?

Answer 8

• The innermost layer of the meninges is the Pia Mater, and it has direct contact with the brain.

Question 9

What is the main function of the choroid plexus?

Answer 9

• The choroid plexus produces cerebrospinal fluid (CSF).

Question 10

What is the production rate of CSF by the choroid plexus?

Answer 10

• The choroid plexus produces approximately 20 mL of CSF per hour.

Question 11

What is the Blood-Brain-Barrier (BBB) and how is it related to the choroid plexus?

Answer 11

• Formed by light-fitting endothelial cells and is a physiologic barrier that separates blood tissue from brain tissue.
• The choroid plexus plays a role in maintaining this barrier.

Question 12

What does the BLOOD-CSF-BARRIER do?

Answer 12

• The BLOOD-CSF-BARRIER separates the blood tissue from cerebrospinal fluid.

Question 13

What is the functional role of the choroid plexus in relation to the CSF?

Answer 13

• The choroid plexus directly produces cerebrospinal fluid (CSF) and acts as a functional barrier.

Question 14

In what way does the choroid plexus help separate different tissues in the brain?

Answer 14

• Helps separate blood tissue and brain tissue
• By maintaining the Blood-Brain-Barrier (BBB) and producing CSF.

Question 15

What is the role of microglial cells in the CNS/brain?

Answer 15

• Serve as macrophages of the CNS/brain, participating in immune responses and tissue maintenance.

Question 16

How are glial cells related to nerve cells in the nervous system?

Answer 16

• Aiding in various functions that support and protect nerve cells.

Question 17

What is the function of ependymal cells in the brain, and how do they contribute to cerebrospinal fluid (CSF) production?

Answer 17

• Help produce enough cerebrospinal fluid (CSF) in the brain.
• They do not have a basement membrane
• They line the brain’s ventricles, playing a role in CSF production and circulation.

Question 18

How does the arrangement of ependymal cells appear when the brain is cut cross-sectionally?

Answer 18

• The middle hole aligns with the ependymal cells, resembling the arrangement of epithelial cells
• Emphasizing their role in lining the brain’s cavities and aiding in CSF production.