Dictionary > External capsule

External capsule

(anatomy) A thin, white sheet of whiter matter fibers in the brain between the putamen and claustrum
The central nervous system is made up of white matter and grey matter. The white matter is an important component of the central nervous system since it is the one relaying and coordinating different brain regions. It is associated with brain learning and dysfunctions. Although it is composed of myelin-coated axons, it is the one controlling the signals that nerve cells share between different brain regions. sup>1 The white fibers separating the claustrum and the lentiform nucleus make up the external capsule. The claustrum is a thin layer of neurons attached to the underside of the neocortex. The lentiform nucleus is the cone-shaped structure located near the internal capsule.
The external capsule is therefore a layer of white matter fibers in the central nervous system. It consists primarily of lipid and fatty tissues. It serves as a route for cholinergic fibers (from basal forebrain) to the cerebral cortex. It also joins the internal capsule around the lentiform nucleus.
See also:


1Fields, Douglas (March 2008). “White Matter”. Scientific American 298 (3): 54–61. Link

You will also like...

DNA - schematic
Genetic Mutations

This tutorial looks at the mutation at the gene level and the harm it may bring. Learn about single nucleotide polymorph..

Chromosomes X and Y and Sex Determination
Chromosomes X and Y and Sex Determination

This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..

Plant biology
Plant Biology

Plantlife can be studied at a variety of levels, from the molecular, genetic and biochemical level through organelles, c..

The Human Physiology
The Human Physiology

Physiology is the study of how living organisms function. Thus, human physiology deals specifically with the physiologic..

Plant Water Regulation
Plant Water Regulation

Plants need to regulate water in order to stay upright and structurally stable. Find out the different evolutionary adap..

Selective Breeding
Selective Breeding

Gregor Mendel's studies into Monohybrid and Dihybrid crossing and Charles Darwin's study of evolution and natural select..