Limbic system

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Brain: Limbic system
Brain limbicsystem.jpg
The limbic system within the brain.
NeuroNames ancil-247
Dorlands/Elsevier s_33/12787580

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Overview

The limbic system (Latin limbus: "border" or "edge") includes the putative structures in the human brain involved in emotion, motivation, and emotional association with memory. The limbic system influences the formation of memory by integrating emotional states with stored memories of physical sensations. (see emotional memory).

Anatomy

The limbic system includes many different cortical and subcortical brain structures that differ depending upon which book is referenced. For ease of interpretation, this is a list of all the regions generally considered to be part of the limbic system:

Function

The limbic system operates by influencing the endocrine system and the autonomic nervous system. The limbic system is highly interconnected with a structure known as the nucleus accumbens, commonly called the brain's pleasure center. The nucleus accumbens plays a role in sexual arousal and the "high" derived from certain recreational drugs. These responses are heavily modulated by dopaminergic projections from the limbic system. In 1954, Olds and Milner found that rats with metal electrodes implanted into their nucleus accumbens would repeatedly press a lever activating this region, and would do so in preference to eating and drinking, eventually dying of exhaustion.[1]

The limbic system is also tightly connected to the prefrontal cortex. Some scientists contend that this connection is related to the pleasure obtained from solving problems. To cure severe emotional disorders, this connection was sometimes surgically severed, a procedure of psychosurgery, called a prefrontal lobotomy (this is actually a misnomer). Patients who underwent this procedure often became passive and lacked all motivation.

There is circumstantial evidence that the limbic system also provides a custodial function for the maintenance of a healthy conscious state of mind.

Evolution

The limbic system is embryologically an older part of the brain. It developed to manage 'fight' or 'flight' chemicals and is an evolutionary necessity for reptiles as well as Homo sapiens.

Recent studies of the limbic system of tetrapods have made data available that challenge some of the long-held tenets of forebrain evolution. The common ancestors of reptiles and mammals had a well-developed limbic system in which the basic subdivisions and connections of the amygdalar nuclei were established.[2]

History

The French physician Paul Broca first called this part of the brain "le grand lobe limbique" in 1878,[3] but its putative role in emotion was not largely developed until 1937, when the American physician James Papez first described his anatomical model of emotion, which is still referred to as the Papez circuit.[4] Papez's ideas were, in turn, later expanded on by Paul D. MacLean to include additional structures in a more dispersed "limbic system," more on the lines of the system described above.[5] The concept of the limbic system has since been further expanded and developed by Nauta, Heimer and others.


da:Limbiske system de:Limbisches System he:המערכת הלימבית nl:Limbisch systeem sk:Limbický systém sl:Limbični sistem fi:Limbinen järjestelmä sv:Limbiska systemet yi:לימביק סיסטעם

  1. Olds, J., Milner, P. 1954. Positive reinforcement produced by electrical stimulation of septal area and other regions of rat brain. J.Comp. Physiolo. Psycholo. 47, 419- 427
  2. Bruce LL, Neary TJ (1995). "The limbic system of tetrapods: a comparative analysis of cortical and amygdalar populations". Brain Behav. Evol. 46 (4–5): 224–34. PMID 8564465.
  3. Broca, P. Anatomie comparée des circonvolutions cérébrales: le grand lobe limbique. Rev. Anthropol. 1878;1:385-498.
  4. Papez JW. A proposed mechanism of emotion. 1937. J Neuropsychiatry Clin Neurosci. 1995;7(1):103-12. PMID 7711480
  5. Maclean, PD. Some psychiatric implications of physiological studies on frontotemporal portion of limbic system (visceral brain). Electroencephalogr Clin Neurophysiol 1952;4(4):407-18. PMID 12998590

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