Cerebrospinal Fluid (CSF) Flashcards

Explore cerebrospinal fluid anatomy, including its production, circulation, absorption, spinal spaces, protective functions, and clinical significance.

Card 1 of 30Question

What is cerebrospinal fluid?

A clear, colorless fluid that surrounds the brain and spinal cord and fills the cerebral ventricles.

In This Section

1. What is cerebrospinal fluid?

A clear, colorless fluid that surrounds the brain and spinal cord and fills the cerebral ventricles.

2. Where is most cerebrospinal fluid produced?

The choroid plexuses of the cerebral ventricles.

3. Which specialized epithelial cells are responsible for cerebrospinal fluid secretion in the choroid plexus?

Modified ependymal cells forming the choroid plexus epithelium.

4. What is the approximate total cerebrospinal fluid volume in a healthy adult?

Approximately 150 mL, with normal individual variation.

5. Approximately how much cerebrospinal fluid is produced daily in adults?

About 400 to 600 mL per day.

6. What is the principal mechanical function of cerebrospinal fluid?

To provide buoyancy and cushioning that protect the brain and spinal cord from mechanical forces.

7. How does cerebrospinal fluid contribute to the chemical environment of the central nervous system?

It helps maintain extracellular homeostasis and facilitates the transport and clearance of substances.

8. Which openings connect the lateral ventricles to the third ventricle?

The interventricular foramina of Monro.

9. Which channel carries cerebrospinal fluid from the third ventricle to the fourth ventricle?

The cerebral aqueduct, also called the aqueduct of Sylvius.

10. Which openings allow cerebrospinal fluid to leave the fourth ventricle and enter the subarachnoid space?

The median aperture of Magendie and the paired lateral apertures of Luschka.

11. Which meningeal space contains cerebrospinal fluid surrounding the spinal cord?

The subarachnoid space between the arachnoid mater and pia mater.

12. How are the cranial and spinal subarachnoid spaces connected?

They are continuous through the foramen magnum.

13. What is the lumbar cistern?

An enlarged portion of the spinal subarachnoid space extending below the conus medullaris to approximately S2.

14. Which neural structures are suspended in cerebrospinal fluid within the lumbar cistern?

The spinal nerve roots forming the cauda equina.

15. At approximately which vertebral level does the spinal subarachnoid space terminate in adults?

The second sacral vertebral level (S2).

16. What are arachnoid granulations?

Projections of arachnoid tissue into dural venous sinuses that provide a pathway for cerebrospinal fluid absorption.

17. Which dural venous sinus is particularly associated with cerebrospinal fluid absorption through arachnoid granulations?

The superior sagittal sinus.

18. Which additional drainage pathway contributes to cerebrospinal fluid clearance?

Lymphatic drainage pathways, including routes associated with cranial and spinal nerve coverings.

19. How does cerebrospinal fluid protein concentration normally compare with plasma?

Cerebrospinal fluid has a much lower protein concentration than plasma.

20. How does normal cerebrospinal fluid glucose concentration compare with blood glucose?

It is typically about 60% of the corresponding plasma glucose concentration.

21. What normally characterizes the cellular content of cerebrospinal fluid?

Very few leukocytes and essentially no red blood cells.

22. Which anatomical structures form the blood-cerebrospinal fluid barrier at the choroid plexus?

Tight junctions between adjacent choroid plexus epithelial cells.

23. What is the principal source of pulsatile cerebrospinal fluid movement within the spinal subarachnoid space?

Cardiac-related changes in intracranial blood volume, with additional respiratory influences.

24. What is hydrocephalus?

Abnormal accumulation of cerebrospinal fluid within the cerebral ventricles, causing ventricular enlargement.

25. What is noncommunicating hydrocephalus?

Hydrocephalus caused by obstruction of cerebrospinal fluid flow within the ventricular system or at its outlets.

26. What is communicating hydrocephalus?

Hydrocephalus in which ventricular pathways remain open, usually involving impaired cerebrospinal fluid absorption.

27. Which intervertebral spaces are commonly used to obtain cerebrospinal fluid by lumbar puncture?

The L3-L4 or L4-L5 intervertebral spaces.

28. Why is cerebrospinal fluid collected from the lumbar cistern rather than at higher spinal levels?

The lumbar cistern lies below the usual termination of the adult spinal cord, reducing the risk of cord injury.

29. Which meningeal membranes must a lumbar puncture needle penetrate to enter cerebrospinal fluid?

The dura mater and arachnoid mater.

30. What causes a typical post-dural puncture headache?

Cerebrospinal fluid leakage through a dural puncture, resulting in reduced cerebrospinal fluid pressure and volume.