Wikia

Psychology Wiki

Column of Clarke

Talk0
34,142pages on
this wiki

Assessment | Biopsychology | Comparative | Cognitive | Developmental | Language | Individual differences | Personality | Philosophy | Social |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |

Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Neuroscience · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology (Index, Outline)


Column of Clarke
Diagram showing a few of the connections of afferent (sensory) fibers of the posterior root with the efferent fibers from the ventral column and with the various long ascending fasciculi. (Dorsal nucleus labeled at center right.)
Latin nucleus thoracicus posterior, nucleus dorsalis
Gray's subject #185 758
System
MeSH [1]
Medulla spinalis - Substantia grisea - English
Schematic of spinal cord grey matter showing location of the Dorsal Nucleus

Clarke's column (column of Clarke, dorsal nucleus, posterior thoracic nucleus) is a group of interneurons found in Lamina VII, also known as the intermediate zone, of the spinal cord.

AnatomyEdit

It occupies the medial part of the base of the posterior column and appears on the transverse section as a well-defined oval area.

It begins below at the level of the second or third lumbar nerve, and reaches its maximum size opposite the twelfth thoracic nerve. Above the level of the ninth thoracic nerve its size diminishes, and the column ends opposite the last cervical or first thoracic nerve.

It is represented, however, in the other regions by scattered cells, which become aggregated to form a cervical nucleus opposite the third cervical nerve, and a sacral nucleus in the middle and lower part of the sacral region.

Nerve cells in Clarke’s column are most abundant between the lower thoracic and upper lumbar segments. Cell bodies are of medium size and oval- or pyriform-shape. Some cells can be as large as anterior horn cells; the nuclei of these larger cells are often found on the periphery of the cell.

FunctionEdit

Clarke’s column is a major relay center for unconscious proprioception. Sensory information for muscle spindles and tendon organs synapses onto posterior root ganglion, which in turn synapses onto Clarke’s column. From Clarke’s column, information continues rostrally until it reaches the cerebellar cortex. This relay pathway is generally known as the spinocerebellar tract.

EponymEdit

It is named for Jacob Augustus Lockhart Clarke.[1][2]

ReferencesEdit

  1. Who Named It synd/2143
  2. J. A. L. Clarke. Researches into the structure of the spinal cord. Philosophical Transactions of the Royal Society of London, 1851, 141: 607-621.

External linksEdit


|}

This page uses Creative Commons Licensed content from Wikipedia (view authors).

Around Wikia's network

Random Wiki