Posterolateral sulcus

Posterolateral sulcus is a feature of the human anatomy specifically found in the spinal cord. It is a groove located on the posterolateral aspect of the spinal cord, running along its length. This sulcus serves as an important landmark for the entry point of the dorsal root fibers into the spinal cord. These fibers are responsible for transmitting sensory information from the periphery of the body to the central nervous system (CNS).

Anatomy

The posterolateral sulcus is situated between the posterior funiculus, which lies medially, and the lateral funiculus, which is found laterally. This positioning makes it a critical point of reference for neuroanatomists and neurosurgeons alike. The dorsal root fibers, which enter the spinal cord at this sulcus, carry sensory modalities such as touch, pain, and temperature from the sensory receptors located throughout the body.

Function

The primary function of the posterolateral sulcus is to act as a gateway for the dorsal root fibers. Once these fibers enter the spinal cord, they either ascend or descend within the cord to reach their respective destinations in the brain or at different levels of the spinal cord. This organization allows for the precise localization and processing of sensory information.

Clinical Significance

The posterolateral sulcus is of clinical importance due to its role in surgical procedures involving the spinal cord. Understanding its location helps in avoiding damage to the sensory fibers during spinal surgeries. Additionally, lesions affecting the dorsal root fibers at their entry point can lead to sensory deficits or neuropathic pain, highlighting the significance of this anatomical feature in diagnosing and treating spinal cord injuries and diseases.

See Also

• Spinal cord
• Dorsal root ganglion
• Central nervous system
• Neuroanatomy