Posterolateral tract

Gray669.png

Posterolateral tract

The posterolateral tract, also known as the Lissauer's tract, is a bundle of nerve fibers located in the spinal cord. It is situated in the white matter of the spinal cord, specifically in the dorsal part of the lateral funiculus. This tract plays a crucial role in the transmission of pain and temperature sensations to the brain.

Anatomy

The posterolateral tract is found at the edge of the dorsal horn of the spinal cord. It consists of small-diameter, unmyelinated or lightly myelinated nerve fibers that originate from the dorsal root ganglia. These fibers enter the spinal cord and ascend or descend a few segments before synapsing in the dorsal horn.

Function

The primary function of the posterolateral tract is to carry pain and temperature sensations from the peripheral nerves to the central nervous system. The fibers in this tract are part of the spinothalamic tract, which ultimately transmits these sensory signals to the thalamus and then to the cerebral cortex for processing.

Clinical Significance

Damage to the posterolateral tract can result in a loss of pain and temperature sensation below the level of the lesion. This can occur due to various conditions such as spinal cord injury, multiple sclerosis, or syringomyelia. Understanding the anatomy and function of the posterolateral tract is essential for diagnosing and managing these conditions.

Related Structures

• Dorsal root ganglion
• Spinothalamic tract
• Dorsal horn
• Thalamus
• Cerebral cortex

See Also

• Spinal cord
• Nervous system
• Pain pathway
• Temperature sensation