What are the parts of the posterior column?

The posterior grey column (posterior cornu, dorsal horn, spinal dorsal horn, posterior horn, sensory horn) of the spinal cord is one of the three grey columns of the spinal cord. It receives several types of sensory information from the body, including fine touch, proprioception, and vibration.

What is the dorsal column medial lemniscus pathway?

The dorsal column-medial lemniscal pathway (DCML) carries the sensory modalities of fine touch (tactile sensation), vibration and proprioception. In the spinal cord, information travels via the dorsal (posterior) columns. In the brainstem, it is transmitted through the medial lemniscus.

What is the function of the dorsal column?

AKA posterior columns, the dorsal columns refers to the posterior spinal cord, which contains ascending sensory pathways that carry information about tactile sensations and proprioception.

What is the function of the thalamus in the dorsal column pathway?

Pathway of Action Impulses Through the Dorsal Column Speaking of the thalamus, the fasciculus gracilis and fasciculus cuneatus also send impulses from the spinal cord up to the thalamus for the sensations of touch, pressure, and proprioception (also known as kinesthesia).

What is posterior column dysfunction?

Posterior cord syndrome is a rare type of incomplete spinal cord injury that affects the dorsal columns of the spinal cord (found in the posterior—or backside—region of the spinal cord), responsible for the perception of fine-touch, vibration, sense of self-movement, and body positioning (proprioception).

Where does the posterior column cross?

The neurons in these two nuclei (the dorsal column nuclei) are second-order neurons. Their axons cross over to the other side of the medulla and are now named as the internal arcuate fibers, that form the medial lemniscus on each side. This crossing over is known as the sensory decussation.

What is posterior column medial lemniscus?

The dorsal column–medial lemniscus pathway (DCML) (also known as the posterior column-medial lemniscus pathway, PCML) is a sensory pathway of the central nervous system that conveys sensations of fine touch, vibration, two-point discrimination, and proprioception (position) from the skin and joints.

What is posterior column disease?

Where does the posterior column Decussate?

The fibres of this decussation are called the internal arcuate fibres and are found at the superior aspect of the closed medulla superior to the motor decussation. It is part of the second neuron in the posterior column–medial lemniscus pathway.

What are the two major somatosensory pathways?

The somatosensory system consists of the two main paired pathways that take somatosensory information up to the brain: the medial lemniscal or posterior pathway, and the spinothalamic or anterolateral pathway. The somatosensory pathways are made up of a relay of four neurons.

What is posterior white column?

Posterior column disease involves selective damaging of the posterior column, known as tabes dorsalis neurosyphilis. The Romberg test is used for the clinical assessment of patients with disequilibrium or ataxia from sensory and motor disorders.

What is posterior column?

The posterior column, also known as the dorsal column, consists of the white matter within the dorsomedial portion of the spinal cord. It is composed of the fasciculus gracilis and cuneatus, which itself is part of the dorsal funiculus. Its primary role is to convey afferent information regarding fine touch, vibration,…

What is posterior column of spine?

posterior column the posterior portion of the gray substance of the spinal cord, in transverse section seen as a horn.

What is anterior column?

anterior column of spinal cord. n. The ventral ridge of gray matter in each half of the spinal cord, containing the motor neurons innervating the skeletal musculature of the trunk, neck, and extremities.