## **Core Concept**
The transmission of pain and temperature sensations in the nervous system is primarily facilitated by specific pathways. These sensations are detected by nociceptors and thermoreceptors and transmitted to the brain through distinct tracts. The spinothalamic tract is a key pathway involved in the transmission of pain, temperature, and crude touch.

## **Why the Correct Answer is Right**
The **spinothalamic tract**, specifically the lateral spinothalamic tract, is responsible for transmitting pain and temperature sensations from the body to the brain. This tract originates from the dorsal horn of the spinal cord, crosses at or near the level of entry into the spinal cord (forming the anterolateral system), and ascends to the thalamus. The spinothalamic tract is crucial for the perception of pain and temperature.

## **Why Each Wrong Option is Incorrect**
- **Option A:** The **dorsal column-medial lemniscus pathway** primarily transmits sensations of fine touch, vibration, and proprioception (position sense), not pain and temperature.
- **Option B:** The **corticospinal tract** is involved in motor function, transmitting signals from the brain to the spinal cord to control voluntary movements, not sensations like pain and temperature.
- **Option D:** The **olivocerebellar pathway** is part of the cerebellar peduncles and is involved in coordinating motor activities and learning, not in transmitting pain and temperature sensations.

## **Clinical Pearl / High-Yield Fact**
A key clinical correlation is the **Brown-Séquard syndrome**, which results from a hemisection of the spinal cord. This condition leads to ipsilateral weakness (due to corticospinal tract damage) and loss of proprioception (due to dorsal column damage), along with contralateral loss of pain and temperature sensation (due to spinothalamic tract damage).

## **Correct Answer:** C. Spinothalamic tract.