A ventrolateral cordotomy is performed to produce relief of pain from the right leg. It is effective because it interrupts the –
## **Core Concept**
A ventrolateral cordotomy is a surgical procedure used to relieve intractable pain by interrupting the spinothalamic tract. The spinothalamic tract is responsible for transmitting pain and temperature sensations from the body to the brain. This procedure targets the lateral spinothalamic tract, which carries pain and temperature fibers.
## **Why the Correct Answer is Right**
The correct answer, **spinothalamic tract**, is right because the ventrolateral cordotomy specifically aims to interrupt the lateral spinothalamic tract. This tract is crucial for transmitting pain and temperature sensations. By performing a cordotomy on one side of the spinal cord, the procedure effectively blocks the transmission of pain signals from the opposite side of the body due to the decussation of spinothalamic fibers at or near the level of entry into the spinal cord.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it is not specified, making it impossible to assess its accuracy.
- **Option B:** This option is incorrect because it is not specified, making it impossible to assess its accuracy.
- **Option D:** This option is incorrect because it is not specified, making it impossible to assess its accuracy.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the spinothalamic tract crosses at the spinal level (or shortly after entering the spinal cord), which is why a ventrolateral cordotomy on one side of the spinal cord can relieve pain on the opposite side of the body. This procedure is particularly effective for managing severe, unilateral pain that has not responded to other treatments.
## **Correct Answer:** C. spinothalamic tract.