The topic of Anterior white commissure has generated great interest and debate in recent years. With conflicting opinions and diverse positions, Anterior white commissure has become a point of discussion between experts and society in general. In this article, we will explore different aspects of Anterior white commissure, from its origin to its impact today. We will analyze the different perspectives that exist around Anterior white commissure, as well as its relevance in different areas. Additionally, we will examine how Anterior white commissure has evolved over time and what its future projection is. Join us on this journey to discover everything you need to know about Anterior white commissure!
Anterior white commissure of the spinal cord | |
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Details | |
Identifiers | |
Latin | Commissura alba anterior medullae spinalis, alba anterior medullae spinalis |
TA98 | A14.1.02.305 |
TA2 | 6125 |
FMA | 77035 |
Anatomical terms of neuroanatomy |
The anterior white commissure (ventral white commissure) is a bundle of nerve fibers which cross the midline of the spinal cord just anterior (in front of) to the gray commissure (Rexed lamina X). A delta fibers (Aδ fibers) and C fibers carrying pain sensation in the spinothalamic tract contribute to this commissure, as do fibers of the anterior corticospinal tract, which carry motor signals from the primary motor cortex.
Two of the five sensory modalities, pain and temperature, cross sides at the anterior white commissure, reaching the contralateral side about two vertebral levels rostral to their origin. The spinothalamic tract thus decussates very soon after entering the spinal cord, ascending in the spinal cord, contralateral to the side from where it provides (pain and temperature) sensory information. Therefore, a lesion that is caudal to the sensory decussation where the remaining three-fifths modalities decussate (at the superior medulla) will result in contralateral (opposite sided) pain and temperature loss (as this has already crossed over at the anterior white commissure), whereas loss of crude touch, pressure, and proprioception will be ipsilateral (same sided) as these have not yet crossed over.