CSF Functions and Specimen Collection

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What is the primary function of CSF in relation to the brain?

To provide structural support

To regulate body temperature

To cushion the brain by providing a bath in which it floats (correct)

To facilitate circulation of nutrients

How often is the CSF completely replaced?

Every 2 to 3 hours

Every 24 to 48 hours

Every 12 to 24 hours

Every 5 to 7 hours (correct)

What is the usual method of collecting CSF specimens?

Ventricular shunt

Cisterna magna tap

Lumbar puncture (correct)

Cannula insertion

What is the purpose of an Ommaya reservoir in patients undergoing chemotherapy?

To introduce chemotherapeutic drugs and withdraw CSF periodically Signup and view all the answers

Why is it essential to process CSF specimens quickly?

To prevent cell degeneration Signup and view all the answers

What is the characteristic appearance of normal CSF?

Clear and colourless Signup and view all the answers

What is the characteristic feature of yeast cells when stained with Pap technique?

A halo around the centrally stained area Signup and view all the answers

What is the most common primary CNS tumor in children?

Medulloblastoma Signup and view all the answers

What is the function of the supporting tissue of the CNS?

To provide structural support to the CNS Signup and view all the answers

What is the importance of CSF cytology in diagnosing neoplastic conditions?

It is used to diagnose both primary and secondary CNS tumors Signup and view all the answers

What is the purpose of special stains like mucicarmine or Gomori-methenamine silver in diagnosing Cryptococcus neoformans?

To facilitate the diagnosis of Cryptococcus neoformans Signup and view all the answers

What is characteristic of choroid plexus/ependymal cells?

Central, round or oval nuclei with delicate chromatin Signup and view all the answers

Which type of cell is never found in specimens obtained by LP?

Neurons Signup and view all the answers

What is the function of astrocytes and oligodendrocytes?

To support neurons in the CNS Signup and view all the answers

What is the characteristic of astrocytes' cytoplasm?

Finely fibrillar with poorly defined borders Signup and view all the answers

What is the shape of astrocytes?

Spindle or oval shaped with multiple branches Signup and view all the answers

What is the characteristic of oligodendroglial cells' nuclei?

Small, single, round to elongated & hyperchromatic Signup and view all the answers

CSF Functions and Specimen Collection

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