Stereotaxic Radio Frequency Lesioning in Rats

This section outlines the essential steps for performing a Radio Frequency (RF) lesion using a stereotaxic apparatus in a rat, based on the logical progression of the surgical procedure.

Key Procedural Steps

The procedure involves preparing the animal, targeting the specific brain area, applying the RF current, and concluding the surgery.

Step 1: Animal Preparation and Stabilization

D. Fix the head of the rat on the stereotaxic apparatus
The initial step involves securely immobilizing the rat's head within the stereotaxic frame. This ensures the head remains stable and precisely positioned throughout the procedure, allowing for accurate targeting of brain structures.

Step 2: Target Localization and Access

A. Drill a hole in the skull of the rat using coordinates from the stereotaxic atlas
After securing the head, the stereotaxic atlas coordinates are used to identify the precise location for the lesion. A small hole is then drilled through the skull at these coordinates to allow access to the target brain region.

Step 3: Electrode Insertion

E. Push an electrode to the appropriate depth of the brain till it touches the specified brain area
Once the skull is breached, an insulated electrode is carefully lowered to the predetermined depth using the stereotaxic instrument's vertical control. The electrode tip must reach the exact target location identified using the atlas coordinates.

Step 4: Lesion Creation

B. Pass on radio frequency current through the tip of the insulated electrode to the brain area
With the electrode correctly positioned, a controlled radio frequency current is applied. This current heats the tissue immediately surrounding the electrode tip, creating the desired lesion in the specific brain area.

Step 5: Procedure Completion

C. Close the hole on the skull of the rat and provide appropriate medical treatment
Following the lesioning, the electrode is retracted. The drilled hole in the skull is then closed, and the rat receives necessary post-operative care, including pain management and monitoring, to ensure recovery.

Sequence Summary

The correct sequence integrating these steps is: D, A, E, B, C.