Anterior median fissure

Anterior Median Fissure is a longitudinal groove found on the anterior (front) surface of the spinal cord. It is one of the two grooves that divide the spinal cord longitudinally, the other being the posterior median sulcus. The anterior median fissure contains a fold of pia mater, a delicate innermost layer of the meninges, the membranes that cover the central nervous system.

Anatomy

The anterior median fissure extends along the length of the spinal cord and is wider and deeper than the posterior median sulcus. It is filled with a loose meshwork of connective tissue and blood vessels. The anterior median fissure marks the division between the two halves of the spinal cord, each of which is referred to as a hemisection.

Function

The anterior median fissure serves as a pathway for blood vessels to reach the spinal cord. It also provides a route for the anterior spinal artery, which supplies blood to the anterior two-thirds of the spinal cord.

Clinical Significance

Damage or disease affecting the area of the anterior median fissure can have significant effects on the function of the spinal cord. For example, anterior spinal artery syndrome is a condition where the blood supply through the anterior spinal artery is interrupted, often due to a blockage in the artery. This can lead to loss of motor function and pain and temperature sensation, while preserving touch and vibration sensation.

See Also

• Spinal cord
• Posterior median sulcus
• Anterior spinal artery syndrome