Posterior column

(Redirected from Posterior columns)
Jump to: navigation, search

Please Take Over This Page and Apply to be Editor-In-Chief for this topic: There can be one or more than one Editor-In-Chief. You may also apply to be an Associate Editor-In-Chief of one of the subtopics below. Please mail us [1] to indicate your interest in serving either as an Editor-In-Chief of the entire topic or as an Associate Editor-In-Chief for a subtopic. Please be sure to attach your CV and or biographical sketch.

Overview

The posterior column refers to the area of white matter in the dorsomedial side of the spinal cord. It is made up of the fasciculus gracilis and fasciculus cuneatus and itself is part of the dorsal funiculus. It is part of an ascending pathway that is important for well-localized fine touch and conscious proprioception called the posterior column-medial lemniscus pathway.

Joint capsules, tactile and pressure receptors send a signal through the dorsal root ganglia up through the fasciculus gracilis for lower body sensory impulses and the fasciculus cuneatus for upper body impulses. Once the fasciculus gracilis reaches the nucleus gracilus and the fasciculus cuneatus reaches the nucleus cuneatus in the lower medulla, they begin to cross over the medulla as the internal arcuate fibers. When they reach the contralateral side, they become the medial lemniscus, which is the second part of the posterior column-medial lemniscus pathway.

Lesions in this pathway can diminish or completely abolish tacile sensations and movement or position sense below the lesion.

References

  • Clinical Neuroanatomy Made Ridiculously Simple



Linked-in.jpg