Certified Registered Nurse Anesthetist (CRNA) Practice Exam

Where is a bolt typically placed in the context of neurosurgery?

1. Subdural space

2. Dura mater and pia mater

3. Subarachnoid space and dura mater

4. Epidural space

The correct answer is: Subarachnoid space and dura mater

In neurosurgery, a bolt is typically placed in the subarachnoid space and dura mater for the purpose of monitoring intracranial pressure or administering therapeutic interventions. This region is critical because it allows for direct access to the cerebrospinal fluid (CSF), enabling accurate monitoring of pressure changes within the intracranial cavity. The subarachnoid space is filled with CSF, which acts as a cushion for the brain, and accessing this space is essential for both diagnostic and therapeutic procedures. Placement of a bolt in the dura mater and subarachnoid region provides a stable and secure method to continuously monitor intracranial pressure without significantly disrupting the surrounding brain tissue. This careful placement minimizes potential complications and optimizes patient safety during neurosurgical interventions.