Question 10

Intrathecal

The route by which a drug is introduced into the subarachnoid space surrounding the brain and the spinal cord is intrathecal administration. This method allows for direct delivery of medication to the central nervous system.

A) intraperitoneal

Intraperitoneal administration involves injecting a substance into the peritoneal cavity, which is not related to the subarachnoid space. This method is commonly used for certain types of chemotherapy and is not suitable for accessing the central nervous system directly.

B) intravenous

Intravenous administration delivers substances directly into the bloodstream via a vein. While this method is effective for many treatments, it does not specifically target the subarachnoid space, making it an incorrect choice for the question.

C) intrathecal

Intrathecal administration is the correct answer, as it involves injecting drugs directly into the subarachnoid space. This method allows for higher concentrations of medication at the site of action in the central nervous system while minimizing systemic exposure.

D) intratracheal

Intratracheal administration refers to the delivery of substances directly into the trachea, primarily for respiratory treatments. This route does not access the subarachnoid space and is therefore not applicable to the question.

Conclusion

Intrathecal administration is the only route that directly introduces drugs into the subarachnoid space surrounding the brain and spinal cord, making it the definitive correct answer. All other options, including intraperitoneal, intravenous, and intratracheal, pertain to different anatomical areas and methods of drug delivery, failing to meet the requirements of the question.